Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c12961e2f422baa…

MALICIOUS

PDF

120.1 KB Created: 2021-01-16 21:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 89e8f87f228014a21f10dce42751c9ad SHA-1: 2e44164fb908eb449fd4fde5fcafbafc6e80483a SHA-256: 4c12961e2f422baaa20b026bbb9f271a28d01bdcd95c2a7921a706888e5ccaed
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'traffmen.ru'. Additionally, it exhibits characteristics of a link farm, with numerous external PDF links, one of which leads to a benign S3 bucket. The ML classifier and ClamAV also strongly indicate maliciousness, specifically flagging it as phishing or a trojan. No scripts were extracted, but the primary attack vector appears to be luring the user to malicious content via embedded links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=t%25C3%25A2y+du+k%25C3%25BD+1986 In PDF document text
    • https://bigakobavivab.weebly.com/uploads/1/3/4/7/134747120/70dd8812f1b214.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/xowujaviri.pdfIn PDF document text
    • https://site-1194964.mozfiles.com/files/1194964/galaxy_war_2_mod_apk.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/vimuserawopad.pdfIn PDF document text
    • https://site-1245131.mozfiles.com/files/1245131/appsc_dao_previous_papers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490140/normal_5ffc2ad116db6.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/mogedozara/python_interview_questions_and_answers_for_testers.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/roman_catholic_devotional_songs_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/babul_ki_duayen_leti_ja_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/cannon_fodder_pc_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/7879082958.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/procalcitonina_indicaciones.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/advanced_accounting_2_guerrero_solution_manual_2017.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 28808 bytes
SHA-256: 892ce44a80fa1bc6f057fd0c5cafb510335e11720fbd2b0d3cb4f97f4a633098
font_01_sfnt_off00018bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BC0 5336 bytes
SHA-256: 6f14fc88e797c8571be0a114c9bf05898d4e071e4f0dcf506c8e966d8336f222
font_02_sfnt_off00019ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DDB 23948 bytes
SHA-256: 965b787f71200d787b6ffd349b6be499f91c0a492703960db3253b9832364ca9

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