Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72178a4c070e7f2…

MALICIOUS

PDF

76.4 KB Created: 2021-03-12 09:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 51b25c5736b36995e084fe3489206c46 SHA-1: 4653d640c5f0efe79435d50bfabd65841ccc1e8f SHA-256: e72178a4c070e7f20376ec32294e01d07c11ea532a1fe793ca46fba73701c88c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to memory partitioning, likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://soxebez.ru/strik?utm_term=how+to+partition+memory PDF link annotation
    • http://bunezafax.22web.org/bipolar_affective_disorder.pdfIn PDF document text
    • http://majijeniwadimu.22web.org/bahubali_hd_songs_tamil_free.pdfIn PDF document text
    • http://guwugil.22web.org/fawujemapujotobepawavas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5ff78702d79a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369920/normal_5fec09997ac23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixikebifav.rf.gd/how_to_get_materials_for_engineers_elite_dangerous.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_95f9d9e6f8c54eb3b58983e2aed5f12e.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_a6f9311f627f4bf4971f6b7f44a7f699.pdf?index=trueIn PDF document text
    • http://musolag.rf.gd/kenefitegilidazurowu.pdfIn PDF document text
    • http://roxeruteruda.epizy.com/49136969902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c845de-a45e-491f-af4b-887c3180444f/72351889803.pdfIn PDF document text
    • http://gazezubutajon.rf.gd/what_rhymes_with_pairs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fb130b-b0af-49b2-b8c2-a9e08910bbb6/3650880140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acef80ee-b0fc-4019-8931-6c0ac1e59a88/esl_gerund_infinitive_exercises.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/83776204640.pdfIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_106fb16d9d3d435b8250c93adf4afa7c.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_9b7dac7dac104f83a72483b9380d7789.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_5adf080ab58d4b8db5d1c07215c5edb7.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_b0d6341baeee415a8c00dae0dda568c9.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_279438654744402ab50ec26b277f771a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba72326-3fbe-445b-a701-ad03353f143e/kapulita.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_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 4912 bytes
SHA-256: 4bff3d82cd9232eaca2072a9b9713bbc75876c4e52846b2c3d620802301d5316
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10560 bytes
SHA-256: 2509b4f2f26f878386b3de185d3f566cff88f2b6d7d135e0c8a05a2d4b13bef6

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