Malicious PDF — malware analysis report

Static analysis result for SHA-256 179ae3956149e0be…

MALICIOUS

PDF

78.8 KB Created: 2021-05-14 07:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb52dedb774d38c5cee3b20937b15c9 SHA-1: b6cc5764b0e22406bf321d17b9d8a15db96cc956 SHA-256: 179ae3956149e0be3473d1826637f9c1325f3ef34c2c7c8e3f35029d766ea910
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which are disposable or associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/strik?utm_term=is+there+a+water+filter+in+a+keurig+2.0
    • http://lisolu.org/arabic_grammar_book_in_bengali9i29p.pdf
    • http://ersoil.fun/7475548324826ha7.pdf
    • http://bunnygummy.ru/xovezugbpao.pdf
    • https://cdn-cms.f-static.net/uploads/4446915/normal_601473b59d02e.pdf
    • https://static.s123-cdn-static.com/uploads/4376358/normal_6006efec699d5.pdf
    • http://djami.ru/fetajjdm3m.pdf
    • https://static.s123-cdn-static.com/uploads/4455176/normal_60078c026bdab.pdf
    • https://cdn-cms.f-static.net/uploads/4462982/normal_603c336c80485.pdf
    • https://cdn-cms.f-static.net/uploads/4459163/normal_6041caefa06e0.pdf
    • http://onlinetyz.xyz/21640068981rdbxm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_9e458267a9c9400194fa1c3a278bca0f.pdf?index=true
    • https://s3.amazonaws.com/rafiralexezol/tabekivosi.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_962fe8a70a4247599368c3d801ecc39c.pdf?index=true
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_d9a4506f156a4711a8e0a891faeb5d2b.pdf?index=true
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_1f87944a96f243b9926247f13e5b5610.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_03006fdaacb04a34997f52d8586b44e7.pdf?index=true
    • https://s3.amazonaws.com/mubemutolewe/pilalijisuf.pdf
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_aad2d62034c14fa98ec497e1e335e059.pdf?index=true
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_31f9544f831349498fdc9efdb4251ac8.pdf?index=true
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_b552fa8077ac41cfaaf51638b4d656cd.pdf?index=true
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_f93d0815ea994e58bde3d8aee3ed671d.pdf?index=true
    • 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_off0000f4c2.bin
b56c5d0fb01918af13a6e4e6606f085b71fa7d3aaf3a364f767c85934e939270		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 5428 bytes
font_01_sfnt_off0001074e.bin
f7d7aef64c2a6e2681d46585e8fab7ba60ce4b94abc1b1273280ae9efcfcb3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 11348 bytes

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