Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae922f70933d19ce…

MALICIOUS

PDF

73.9 KB Created: 2021-04-10 21:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56af98cba9d6bc965eb43698d198b5bb SHA-1: 1747db67873746fb675f5c38fd5e5e6d13d0c0a1 SHA-256: ae922f70933d19ce95accaecf567fb4617db5caf252a0ff0b607bae5c9023d4e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to potentially harmful sites.

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-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://pelibifir.ru/strik?utm_term=mrc+search+request
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/jafezimupafelu-rukafa.pdf
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/8524535.pdf
    • http://guwaxata.iblogger.org/60847785370.pdf
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/podipumipi.pdf
    • http://xidatumopof.22web.org/analog_electronics_multiple_choice_questions_with_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4393370/normal_606b49a0a6107.pdf
    • http://didanak.22web.org/converse_plataforma_bota_mujer.pdf
    • https://kifofudodor.weebly.com/uploads/1/3/4/8/134878181/jukiwedid.pdf
    • https://bobitakakafaze.weebly.com/uploads/1/3/5/2/135297082/23faa32235.pdf
    • https://cdn-cms.f-static.net/uploads/4495059/normal_6049df3350ee6.pdf
    • https://xawonetata.weebly.com/uploads/1/3/4/3/134363244/mokesefonepirup.pdf
    • http://wijutomotagam.mypressonline.com/batch_bioreactor.pdf
    • https://cdn-cms.f-static.net/uploads/4459630/normal_6033020cf396f.pdf
    • http://gejudoxe.mypressonline.com/arabiyyah_bayna_yadayk_book_2.pdf
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/kawone.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/vizomigerifewegixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jabodegodonirad.atwebpages.com/three_billy_goats_gruff.pdf
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_9b01adc95f8a4f93b21094d10aea0e1f.pdf?index=true
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_f6e2a97e7629448d9841e05554c66ccb.pdf?index=true
    • http://togipumenotu.epizy.com/kibigur.pdf
    • http://wivonuwexewixir.rf.gd/honda_rebel_300_vs_500_specs.pdf
    • 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_off0000e342.bin
d47edea5c2299cd61cc6d98838378c781069142a361754acf6dbafb443019e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 4988 bytes
font_01_sfnt_off0000f444.bin
359caf2613787992b63bd0f10174039fc18cce9aac63000355629dff5a229439		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 11260 bytes

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