Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc9d1a2dc05916b…

MALICIOUS

PDF

118.1 KB Created: 2021-02-21 00:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2617541d1a6a6a6ceb57277858470ca5 SHA-1: 4349193c2ba5e28951fba9df6aca32027eb0a1de SHA-256: 8fc9d1a2dc05916b11ea6e8122ee94841e59aaf013dec871e17cb9d6f3cd4bdb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing numerous embedded URLs pointing to disposable domains, a common tactic for phishing and malware distribution. Heuristics indicate it's a link farm on disposable hosting, with one URL identified as a known malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

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 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.
  • 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://yafferge.ru/123?utm_term=equivalencias+de+unidades+pdf In PDF document text
    • http://xaxikobovivo.22web.org/audi_rs7_performance_0-_60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5fd7c0290e3a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_602b41f3156fc.pdfIn PDF document text
    • http://maporivibadiwaj.iblogger.org/chemical_equilibrium_sample_problems_answers.pdfIn PDF document text
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/6782437.pdfIn PDF document text
    • http://nusorogexirexi.22web.org/38174053415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_600a736630ab4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393904/normal_5fe03257ebf45.pdfIn PDF document text
    • http://raxijinerig.iblogger.org/sowefuzerawarar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_602922e1afb4d.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/gosete/chicken_invaders_2018.pdfIn PDF document text
    • http://serefelotu.epizy.com/susizim.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/51510007391.pdfIn PDF document text
    • http://ratazudawi.epizy.com/bounce_dryer_sheets_keep_mice_away.pdfIn PDF document text
    • http://wunekoxewufomaf.epizy.com/77438948693.pdfIn PDF document text
    • http://kiwajuku.epizy.com/focus_and_directrix_worksheet_answers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000196fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x196FC 28592 bytes
SHA-256: def097de3df6a2a601df5ecad885819f9da208e04eaa53e6fce09a92e2c93dc2
font_00_sfnt_off000159f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F1 5196 bytes
SHA-256: 1956fcdebec3c5447b2a8b3bc18b1571d6aa682ac7c04cb8522a5bfb2aab0fe9
font_01_sfnt_off00016bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBE 13140 bytes
SHA-256: 6de8ecf391a8d550886456e868274e0c1b1626c8c5e84744254373930fecef40

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