Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3010fdff4333b58…

MALICIOUS

PDF

75.6 KB Created: 2021-03-20 10:32:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1e8fec9904da07745a3216291e17fd7 SHA-1: 9748ad19a4146db24a5b5fd58dc55ad5ad507a67 SHA-256: c3010fdff4333b586ed0e2d7f18cbe765d4b2793a5ad39f1508882749ff7598e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://dugedepap.ru/strik?utm_term=how+to+size+pwm+solar+charge+controller PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388405/normal_5fde299f292cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5fe95f610d373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459325/normal_5fe675ac396bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500883/normal_6001a3d513b8b.pdfIn PDF document text
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/3720839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382421/normal_5fceaaa5ad3f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5ffce105b0b94.pdfIn PDF document text
    • https://saxetesaw.weebly.com/uploads/1/3/5/3/135301220/21db6a41.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/62176385772.pdfIn PDF document text
    • https://cdn.sqhk.co/gatutojuse/4hgVjaQ/bluestacks_app_pending.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/ZMjfhjv/30739243694.pdfIn PDF document text
    • https://cdn.sqhk.co/lasukojizix/HjhGxij/5868706097.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/ibF3Z9w/juegos_de_la_rex_y8.pdfIn PDF document text
    • https://tajuweselu.weebly.com/uploads/1/3/4/3/134362517/nizidug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_6032adb9039a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411923/normal_5ff174b1eb35f.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/kevelirusulogamewafo.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/analemma_tower.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/44445015291.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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 5448 bytes
SHA-256: c531d6ece775969d1523d2a1e7b3e469f55e753dc120975fe2b645ac70f09175
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 10764 bytes
SHA-256: e89fe02d2a2705f6b2cd01c0f819ec89fead62a8aac93d900ca4416f5e643ac0

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