Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d947fe75e20ecb…

MALICIOUS

PDF

76.0 KB Created: 2021-02-15 22:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a457a24d859e08885336c6ece2f6c11 SHA-1: 0c26ce0ba9ddf24822b6561982259ce96491f5a9 SHA-256: d5d947fe75e20ecb316dc78f022f6ab86a50a6303f3b0fe738ef6ca395fb676f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. One of the primary external links points to 'maypoin.ru', which is suspicious. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect the user to potentially malicious content or to manipulate search engine results.

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://maypoin.ru/123?utm_term=how+true+is+mrs+lowry+and+son PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378157/normal_6000acab15604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_602099bfa4e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_6014fb1d939c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_60233524ab2f0.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/rarizu.pdfIn PDF document text
    • https://womagojewe.weebly.com/uploads/1/3/5/9/135961056/fipuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_600e30acca209.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404987/normal_5feed4b19aceb.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://s3.amazonaws.com/besafefaf/angry_birds_rio_game_apkpure.pdfIn PDF document text
    • http://jukigegamoma.epizy.com/53793776687.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/widebumovanuli.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/19750612648.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/80831182451.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/boss_telugu_movie_hd_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/80753261434.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/bosoripew.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_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 5008 bytes
SHA-256: c6a377412504a7ff618e91b136d4bb743e69d076cbe640b54cf12884c727d07f
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10780 bytes
SHA-256: 3489acb89657823aa71a4740406e1454261061eabfa3e2d1b4c45eb439b3c8d5
font_02_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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