Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f40edad1369d2c9…

MALICIOUS

PDF

91.3 KB Created: 2021-04-08 15:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a925e7eb31732237645588777f4ff06a SHA-1: 210ed314c175a304f84b0229fb1e68bbb7c915e8 SHA-256: 0f40edad1369d2c9f0e8b9b526fa2c792ef65f907460f6f789d4d900f982b56f
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or redirectors, indicative of a link farm or phishing lure. The embedded URL and the heuristic PDF_SEO_LINK_FARM strongly suggest this document's purpose is to drive traffic to malicious or deceptive websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious intent related to web-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=what+does+chb+stand+for+in+medical+terms PDF link annotation
    • https://zuwodavipufowaf.weebly.com/uploads/1/3/1/4/131408056/wadabikebedefe.pdfIn PDF document text
    • http://homebig.space/zutilolizimazugbupmo.pdfIn PDF document text
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/b066ee2.pdfIn PDF document text
    • http://usacreditreport.info/what_substances_is_covalently_bondedj03rh.pdfIn PDF document text
    • http://osthondroz.com/clouds_wallpaper_pinkc4yyb.pdfIn PDF document text
    • http://outputqwvk.space/fijifowunoh7c2d.pdfIn PDF document text
    • https://xekozetona.weebly.com/uploads/1/3/4/5/134508060/nedojagovujo_gukuzisipedur.pdfIn PDF document text
    • http://copyrighthelpptteam.com/resolving_vectors_worksheet_physicsrnsco.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/5219498.pdfIn PDF document text
    • https://dogodomob.weebly.com/uploads/1/3/4/0/134017369/xubewapazamonuv.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/0425984e-76c0-401d-8dc9-3c8bf4b8fbe1/how_old_is_klaus_baudelaire_now.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/nonadiwotufor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab431e1a-1124-4ccd-a8e2-f315b85a5cce/93923062805.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/39375132565.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_58355247850548adb73c90f5cda62eb3.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_7963c444b8af449c83a0074e7d3d490a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e82bccd-6fab-462c-8e4b-2b7c2f9990f1/s_kiu_truyn_phim_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/corona_sdk_native.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a2c1ad-96b7-40b3-81e6-2766d498b0bb/how_to_sew_designer_dresses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b9c52c-8b5c-4d80-88a4-524ac7e03140/history_of_the_black_dollar.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001195b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 5204 bytes
SHA-256: 71710840494b2d1d2d3203723662448d8171f806b6bf44c6a0c31994ee8c3ba6
font_01_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 11688 bytes
SHA-256: e56742d327f4faa8829c3beecfa292b59cc38adc634fec623f84ac0b1c4daecb
font_02_sfnt_off000151fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151FB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3