Malicious PDF — malware analysis report

Static analysis result for SHA-256 18470b9be8924a78…

MALICIOUS

PDF

75.8 KB Created: 2021-06-12 23:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e1fe6b8ab4c91fcf10e674fecec18ac3 SHA-1: 15ae08859370ec25d53d45e82728afd133df9d6c SHA-256: 18470b9be8924a78898b9c161efac096622de86125cfeaf351f86cb8aaf5b9fb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs and the link farm structure suggest this PDF is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/123?utm_term=google+play+store+update++uptodown PDF link annotation
    • https://bapumuper.weebly.com/uploads/1/3/1/1/131164114/retaziri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_603cb26e08c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_60446996d59fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476564/normal_5ff1c183c20c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_6050b9e6b6edc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403276/normal_5fcda60221418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_6018fc7972546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_5ff75f81f10a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_6009f10f381d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_604dee512308b.pdfIn PDF document text
    • https://garururukipu.weebly.com/uploads/1/3/4/2/134235121/f5102502b763e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5ffc2cf5317cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144422943/free_robux_redeem_card_codes_2021.pdfIn PDF document text
    • http://dojejezo.pbworks.com/f/83983345864.pdfIn PDF document text
    • http://sonubugu.pbworks.com/w/file/fetch/144895734/freestyle_rap_beat_hard_boom_bap_type_beat.pdfIn PDF document text
    • http://fizokaduruj.pbworks.com/f/61051824679.pdfIn PDF document text
    • http://vedufid.pbworks.com/w/file/fetch/144578046/is_bubble.tea_healthy.pdfIn PDF document text
    • http://guzopisuw.pbworks.com/f/how_to_claim_centrelink_benefits.pdfIn PDF document text
    • http://vogivakazela.pbworks.com/w/file/fetch/145090782/rakavogiwifof.pdfIn PDF document text
    • http://negipidini.pbworks.com/f/13106664149.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/76850332612.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_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 5352 bytes
SHA-256: 2504f08bd1bec119cac82480f7aa5a70421d9fe2358f8ff745399c91657a2368
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10960 bytes
SHA-256: 596f83cc7dd3bb9126e8648f7fd2ac8b8241697da1c5762069bcbbc8cae2115b

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