Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d50f47293290f09…

MALICIOUS

PDF

75.8 KB Created: 2021-02-12 05:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 673e2cfa3a2dacf254ebc6d45506c88e SHA-1: d9478de0ed32a1bb46cab4ca6f6c2c8a82341fe8 SHA-256: 7d50f47293290f099fe0a9a09582f10dad98a3d07969c13f8c8bb50e958df448
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of external links, indicating a link farm or redirection mechanism. The PDF_SEO_LINK_FARM heuristic specifically points to a large number of external PDF links, suggesting a coordinated effort to drive traffic to other sites. The embedded URLs are likely used to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/wix?keyword=eldest+pdf+weebly PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420617/normal_5fdf4bf545649.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/5cggp6f/claw_machine_games_online_free.pdfIn PDF document text
    • http://boxidodo.22web.org/abba_waterloo_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_6007c89c3e3f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_5fd10de7e5d37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5ff810b08336c.pdfIn PDF document text
    • http://wegisinebirixe.iblogger.org/58832484833.pdfIn PDF document text
    • http://nuzenurego.22web.org/63568910041.pdfIn PDF document text
    • https://xudepafuvinuk.weebly.com/uploads/1/3/0/9/130969511/8b66fd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5fd0e702c59eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384645/normal_5ff97bdabae7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_6011d3254ca21.pdfIn PDF document text
    • http://wegasanapifare.iblogger.org/tivesizowuvurevaboxofete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pezofut/taboo_imdb_episode_guide.pdfIn PDF document text
    • http://gelapuduwo.epizy.com/canons_of_dort_reformed.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/xematakarikujuruda.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/barbershop_2_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/58802059046.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_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 5020 bytes
SHA-256: 1af694117f603dd74c2fa89a373e50de40a1077649af39c83bbc24f6ae11986f
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 10484 bytes
SHA-256: f47763c65bca2e59576e0f9071e93b5d7824d892bc739d96c9383e99d814b2e3

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