Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a03f166d4767832…

MALICIOUS

PDF

63.8 KB Created: 2020-12-18 13:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 531f9747e6626d5f965e13067a35183a SHA-1: 1d18835041850ed6e71879cf3f9e95480774a63e SHA-256: 8a03f166d47678320e436c7a98f6b942f8e86d688df0bfc32efcdce072b7fa4c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, with the file being identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of many external links points towards a phishing or content-serving attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=blackpink+boombayah+lyrics
    • https://cdn-cms.f-static.net/uploads/4450257/normal_5fbc3a7be1780.pdf
    • https://static.s123-cdn-static.com/uploads/4366009/normal_5fc8a06c11c3c.pdf
    • https://cdn-cms.f-static.net/uploads/4450036/normal_5fb6830901b03.pdf
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/sosofud-bemomibomoxifo.pdf
    • https://cdn-cms.f-static.net/uploads/4426967/normal_5fbbb5f11e414.pdf
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/9733883.pdf
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5fd604a835efc.pdf
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/rezovovob.pdf
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/lawub-geredilewib-foreduzex-dibafepugefexub.pdf
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/28ba1e873fae2cb.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5faa6ff28535f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/daselex/fisafadedozopivokibosedof.pdf
    • https://s3.amazonaws.com/satulibaren/s_f_u_full_form.pdf
    • https://uploads.strikinglycdn.com/files/4b587597-8573-4ebc-9093-07249d83e5fc/age_of_war_4_hacked_unblocked.pdf
    • https://s3.amazonaws.com/xabalaru/english_alphabets_writing_practice_worksheets.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b193.bin
aab3c7edaab2723072a272d23bf35c47263d5da0f7c547f95e8d7c77e629f656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 2944 bytes
font_01_sfnt_off0000bc1e.bin
cc3304b663f78bd0b82929f97c0993c37890d82d8f7950599401ea24cda41a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1E 5528 bytes
font_02_sfnt_off0000cec5.bin
b07594aef28b1e2eb56ac420e0a348ff37b701a6643823bd6a89a044d8dee435		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 10084 bytes

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