Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebaca831dd65708…

MALICIOUS

PDF

76.4 KB Created: 2021-02-17 02:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aa4cb44fce55253f02a03d2c1dd470ec SHA-1: ca777102f9b805c020c3c39ef71ebffb17415438 SHA-256: 4ebaca831dd657085aef2fb03adaab58858a09eb17857370729eb7ea933e5ddd
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. It contains a link farm with numerous external URLs hosted on disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, appears to be a lure related to a common search query.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/123?utm_term=where+is+the+lint+trap+on+stacked+washer+dryer PDF link annotation
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/dejonegeduxopetoxef.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/idrUEYu/8329788153.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/f6a43e117c0a4b.pdfIn PDF document text
    • https://cdn.sqhk.co/zipuzedozame/eigPasl/jungle_castle_run_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_6022aa0e8026d.pdfIn PDF document text
    • https://cdn.sqhk.co/kosibowo/MjiK4hh/is_there_a_strategy_guide_for_ff7_remake.pdfIn PDF document text
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/93feeeeb145a74.pdfIn PDF document text
    • https://nojufetabug.weebly.com/uploads/1/3/4/7/134748112/fekab.pdfIn PDF document text
    • https://faxojoduso.weebly.com/uploads/1/3/5/3/135351685/dejarus.pdfIn PDF document text
    • https://gajubunumokava.weebly.com/uploads/1/3/4/3/134341855/7754753.pdfIn PDF document text
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/towike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumilofu.rf.gd/8505714225.pdfIn PDF document text
    • http://purevaxa.epizy.com/hepatocellular_jaundice.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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 5432 bytes
SHA-256: d7ef7a290b5199585c16ee3ff94999d21d890a6567f8e1424bc2b75024490b3b
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 10624 bytes
SHA-256: adaf71e6a4e06833fe7c46a5fd5750adaa86b1672053a450a170b6f8459c2739

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