Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a1150c39cb7d6a…

MALICIOUS

PDF

75.7 KB Created: 2021-03-11 11:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6abd6873cd66d371ae25fa5c5ec0099 SHA-1: 9d5503e184a0229e2bb04b541d25d27ccf1d2ca1 SHA-256: d8a1150c39cb7d6a03ee48e7fa872c1233e1a36b98b5f2e9bb9bbcde586edeca
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily corrupted, contains references to 'vegan bodybuilder' and 'wkhtmltopdf', indicating a potential lure to drive traffic to malicious sites. No scripts were extracted, but the extensive link farm and the ML classification strongly suggest a malicious intent to redirect users.

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://dafemum.ru/strik?utm_term=what+do+vegan+bodybuilder+eat
    • http://kvrovk.xyz/zotawatimebuxesujy7qax.pdf
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5fde318270e81.pdf
    • http://idealica-columbia.site/bertrand_russell_history_of_western_philosophy6kc1l.pdf
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/900538.pdf
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/4df2b97e8f3ac.pdf
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5fc69133239df.pdf
    • http://the-glow.ru/dictionary_download_english_to_tamilx6jsx.pdf
    • http://fruit-citrus.space/28811135364syd87.pdf
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/62509.pdf
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/pedetemulena.pdf
    • https://cdn-cms.f-static.net/uploads/4422367/normal_60483563c2547.pdf
    • https://cdn-cms.f-static.net/uploads/4491933/normal_6035ca9a1e623.pdf
    • https://mikudope.weebly.com/uploads/1/3/5/3/135305195/temajabipixeguref.pdf
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/kafefejikojebasosen.pdf
    • http://sayfelengs.space/zafipamuzarixuxukajejire5195.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_1893ed3caf7746ca962cce9b95dc168b.pdf?index=true
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_ed00ae4cffa949158f6c862e6c1afe04.pdf?index=true
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_4a5c61abf43a421b85a9ca452db450c3.pdf?index=true
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_5ae3dacdebdd4742b3bd49d232e9f768.pdf?index=true
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_8750916d881946f18b34ac95ec51001d.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_off0000eaff.bin
962b9fa6a21cf1899774c5bf10935b90f1b5f4b953b60e9133750b78e0a3c5eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFF 5224 bytes
font_01_sfnt_off0000fcd5.bin
267afd5e6522140a62d17f94824bc1be11cea4dca2ce4c2176ba5ee46d174a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 10828 bytes

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