Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bf3d05f4be4d2c…

MALICIOUS

PDF

76.2 KB Created: 2021-02-24 03:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b87a2da117b36b952d17f78c6b5511ea SHA-1: f397085845dbfbf156cca4420cc476a77c97a15c SHA-256: d2bf3d05f4be4d2c9dfdf60e57b61ab7f4af7b0f33a29d73ed39fd4813cc472c
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', suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic indicate a phishing or content distribution attack pattern.

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://seumenha.ru/strik?utm_term=dell+u3415wb+screen+replacement PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387713/normal_5fec593810ca5.pdfIn PDF document text
    • https://nasokeluvofof.weebly.com/uploads/1/3/1/4/131453401/tusigi_kutosejudi_kapesebefulu.pdfIn PDF document text
    • http://heartcenteredequestrian.com/69089318037kbuje.pdfIn PDF document text
    • http://onsideball.info/zizuvokuwikamoqgm5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_602c1fd3b001b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_5fd3b6e213e96.pdfIn PDF document text
    • http://coins24h.com/fujoxideweziburosedexerxb4ak.pdfIn PDF document text
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/5272333.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/gonigonodusotiv_razazu.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/rutexa_biwotipifita_kodoxe_fuwopuxakibub.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/9eBYNja/sniper_elite_4_zombie_mode.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/bZ2sjih/politics_and_war_game_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_602bae4b10ced.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/votubukaxogilix/41745858333.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/bengali_horror_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/19593413881.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/mks_baratron_622a_manual.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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 5736 bytes
SHA-256: 8a2ed30849955ff4c8b87072098b98d4919dcaa58a1bde7b211a851379531834
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10368 bytes
SHA-256: 29f6a176b1715e94d59d6ba5bfffa504b04c4d9de76f90e1f4abf848644af324

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