Malicious PDF — malware analysis report

Static analysis result for SHA-256 8141c9418e75c6d4…

MALICIOUS

PDF

75.7 KB Created: 2021-04-26 03:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c5df8c8601c93b21fede1f6d0d75ec68 SHA-1: c6a7c09bef0005b12627b2dd1c20a5ed1bc24a68 SHA-256: 8141c9418e75c6d461c631ce5a84e5dfa1d91f4b78285ff9e3996d0b93e010d1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=philips+srp5107%252F27+codes PDF link annotation
    • https://cdn.sqhk.co/vadavenaw/UvhbUdA/sowasasenaxaxopewapi.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/fnUtjf3/bizopajokab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420745/normal_5fed10640dac6.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/HgOhjgd/16417282384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_6030ffbb0859f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6016ebbb2a594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_601803068a99a.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/okmhawC/download_game_little_commander_2_mod.pdfIn PDF document text
    • http://wobufiparezir.medianewsonline.com/amortization_in_accounting.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_083e19750d7f47c1bbae0f0b44373794.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_dadc1fe2ca474121a86b48da8eb582c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94e9f58a-16ae-45bc-a9fd-5fab98af3a02/39447020092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c28a7a-bb46-4b40-b3ad-f0678935223e/bajar_biblia_de_estudio_vida_plena_gratis.pdfIn PDF document text
    • http://tonavisuma.onlinewebshop.net/castrol_magnatec_5w40_a3_b4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35999af7-925f-46cb-ac6c-b58b78851688/how_to_draw_a_realistic_dragon_step_by_step_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c075fb-a9b4-4673-9b59-8478ba88b596/78130026423.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/nkjv_bible_red_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd2e9ac-b0cd-4e57-a27d-51b8a122a99e/2012_toyota_highlander_hybrid_mpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba05895b-5914-4e78-aead-c963f3092035/mars_is_heaven_by_ray_bradbury.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 5516 bytes
SHA-256: 3e369bebe74f6ba4394682959eb32ce2746a257446bda13a5119ce0908aafd53
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 11328 bytes
SHA-256: ed33228477e77d2138236fd2838425021f87b3aa9f6e9002044391cf10ee24af

Open this report in the interactive analyzer, or submit your own file for analysis.