Malicious PDF — malware analysis report

Static analysis result for SHA-256 7654671aaca81a68…

MALICIOUS

PDF

73.6 KB Created: 2021-04-02 11:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ebb3191719f9af03a25422249199208 SHA-1: 50828f1d2abc8bb75428a55ae672308804345753 SHA-256: 7654671aaca81a68f609ef584628889f23aab342548c068b5d41f0099b6eed6c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The embedded document body, though truncated and partially garbled, suggests a lure related to 'English cartoons for learning English'. The presence of many external links indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/123?utm_term=english+cartoons+for+learning+english
    • https://cdn-cms.f-static.net/uploads/4372696/normal_5fd27c4d6ac09.pdf
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/vofunutuwogodo-bunutidokodi-giwapexemipeli-doporub.pdf
    • https://cdn-cms.f-static.net/uploads/4368475/normal_602b59c6377f2.pdf
    • https://voviteri.weebly.com/uploads/1/3/4/9/134904749/2b81b59a48bb0f.pdf
    • https://cdn-cms.f-static.net/uploads/4368971/normal_6039a4d1b5891.pdf
    • https://cdn-cms.f-static.net/uploads/4417643/normal_600f72e218b38.pdf
    • http://tarekupi.scienceontheweb.net/8773105376.pdf
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/xumoxe.pdf
    • http://difipalilif.scienceontheweb.net/dusudisinagujuwe.pdf
    • https://static.s123-cdn-static.com/uploads/4426816/normal_5fe32c7df3ef8.pdf
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/a730fa6d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a79b57bc-bcb9-4b82-a43a-f3c26a847ff7/34573949954.pdf
    • https://s3.amazonaws.com/vovuzize/the_warrior_diet_book.pdf
    • https://uploads.strikinglycdn.com/files/bde3d049-4c8f-4b5b-9831-1f9805812237/47873610882.pdf
    • https://uploads.strikinglycdn.com/files/b8b064ca-1758-4d83-9c71-75116e77de18/motata.pdf
    • https://uploads.strikinglycdn.com/files/5410d6e0-921b-4b41-ba6e-5555cf5ee21d/4_pics_one_word_level_235_answer.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/62728282853.pdf
    • https://s3.amazonaws.com/farefasejikap/physics_equation_for_final_speed.pdf
    • https://uploads.strikinglycdn.com/files/012fe49a-ae4f-48e4-b294-2fb52af34246/49499978457.pdf
    • https://uploads.strikinglycdn.com/files/3fae7b26-78ab-4799-ac8a-99e2f0172310/xazofofopozototed.pdf
    • https://uploads.strikinglycdn.com/files/dca2bf07-98f4-40ab-9148-f4b375f649b6/nituwe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e165.bin
2d2c8e3bf2175f0f62015068df092d3a20da7876900921a55c4d07ab1a5a6712		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 5100 bytes
font_01_sfnt_off0000f2c1.bin
086cab0ff297e4b305f95f958e5149004c00ae08de766be92dc95a61a145ed11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10640 bytes

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