Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f60b234c11a1d7…

MALICIOUS

PDF

82.9 KB Created: 2021-05-30 10:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aa35ecf2de01d84c8a17b4b8bf4e9e2e SHA-1: 87c4a9d1964d3633bef0a7d1647b56647c77bb39 SHA-256: 55f60b234c11a1d788642a5558bc352130fb9f2707eaed2521db501175bbfade
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download and decrypt an archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=mcse+training+material+pdf PDF link annotation
    • https://mitegasur.weebly.com/uploads/1/3/1/8/131871816/42d094b0f7.pdfIn PDF document text
    • https://xumulevaz.weebly.com/uploads/1/3/5/3/135348617/6c6bb09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5ff81dd1559e6.pdfIn PDF document text
    • https://dukazisilibe.weebly.com/uploads/1/3/4/6/134679988/wanapadawemak_lutexupe_gopalabeko_viwilepobagup.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/1b51eb.pdfIn PDF document text
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/fb3941dd635b8.pdfIn PDF document text
    • https://wivexisi.weebly.com/uploads/1/3/1/0/131070498/2036782.pdfIn PDF document text
    • https://fipubizibogu.weebly.com/uploads/1/3/0/7/130775584/noguduli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457572/normal_5fdc7222056fe.pdfIn PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/numufupavi.pdfIn PDF document text
    • https://serabonileraso.weebly.com/uploads/1/3/4/4/134444783/1340104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_601d21371d597.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416319/normal_5fece79a0217a.pdfIn PDF document text
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/fukulepiximetasa.pdfIn PDF document text
    • https://mirovufi.weebly.com/uploads/1/3/5/9/135958785/1550300.pdfIn PDF document text
    • https://xuzelakojit.weebly.com/uploads/1/3/4/5/134593048/413d106f83a1.pdfIn PDF document text
    • https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/juzovutif.pdfIn PDF document text
    • https://doliwejivus.weebly.com/uploads/1/3/4/3/134353379/6061811.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fa04efcf-ff6b-44b8-912a-8291d85ceab7/28005138352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded679c1-545e-47c5-ad7f-7ae1f269d3e1/best_screen_capture_software_free_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52da2924-54cd-4abf-a23c-5a1501f2aa5e/how_to_silence_a_beeping_smoke_detector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712ff9e8-8035-48ca-a766-84227efe3ed6/how_to_complete_an_incomplete_f_table_0.05.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798352a5-cd15-4f93-9eeb-b35aa810c890/jonakedutomurok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a18acf92-09bb-4fe2-a6a8-4ac42101a377/harry_potter_book_3_illustrated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6134bc-b4ee-4186-a35b-03dd63fc53f2/67460900748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f60f78b-e692-4110-9ae8-525a4e72c324/zukitazesogemukivowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763b0073-87fc-49cb-b170-a20702e3fa8f/tifali.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 5156 bytes
SHA-256: f1f79f50e80972950ec9420b4d390f2b36e18d855b2809e5a29fc03c7e87364b
font_01_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 11244 bytes
SHA-256: 6ae001f54b3c3f292f9bb23cd8f6992d97238a91b378c414bf0ff7d8a67e8edb
font_02_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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