Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c836d9e2724f10…

MALICIOUS

PDF

86.7 KB Created: 2021-03-23 14:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 127260c848765152ec3193ae36f00c7a SHA-1: a9b4e1e7b3d9efadb9b0f3e1d317380428371f16 SHA-256: 85c836d9e2724f1088ac872eaeb0de7ad27af533a3553062a9e79d76462d08cc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://ponafet.ru/strik. The document's structure and embedded links indicate it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/strik?utm_term=porter+cable+c2002+type+4+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fcebe1266f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_6050f63529227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_5fd8396ca3a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fd67778da789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458390/normal_5ff6a66e0bb9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_5fedb9ac27151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408879/normal_5ffc926eb6a5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/148d9be5-2bb2-4c68-9639-4eeb88663615/the_rime_of_the_ancient_mariner_questions_and_answers.pdfIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_60bf11c2054f4a5f93559d3417b832f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e276ff-3fb2-444f-a706-c16b629a5dd3/netters_anatomy_coloring_book_review.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/tibagojafirumokegali.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_f23fe234077e410e8b52db2f7fc254c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb6ea47-651a-4f04-8360-c147c055fd72/what_resulted_from_the_congressional_reconstruction_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c922477b-76e1-480e-9c7b-563f049af0fc/jedaxalolotilakekodug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432764c8-2dfc-49eb-905a-ff149575395c/leragoleto.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_4b467f303b1d4578a8333b926dd03b89.pdf?index=trueIn PDF document text
    • http://xuvunemomot.epizy.com/57678425059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba67b51-d238-40ee-926b-21081935a03a/kedovonefaxafuvosixudej.pdfIn PDF document text
    • http://merofis.epizy.com/74715296220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220111ac-b82b-46bd-b91f-e821bdbb9aa1/old_school_house_music_2000_tracklist.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_c815008f34314cebab7c7837be7f6851.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa43784-6e04-43d0-a498-068a3342b274/29408704116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a02f583-b913-480f-ad33-039585b4a8cb/87040740684.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 5164 bytes
SHA-256: 4be1bd4907c40df587532bdf396a7a134300adfe5ef62754ff9aefa1a67d0e17
font_01_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 11556 bytes
SHA-256: 10fa7ed28f8d3923193bd608a3aa71705cc4e647f34d63a2de5db25647325e86
font_02_sfnt_off00013ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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