Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc77a330085e4a3…

MALICIOUS

PDF

113.6 KB Created: 2020-12-30 20:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4e5a367465613259012c062a47e344cb SHA-1: 9e4200135db18fd45d08966c6522cb078e970289 SHA-256: 6bc77a330085e4a31eebc033b66cbae55ffd65948b508e403a16dc28c1137a10
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both a machine learning classifier and ClamAV. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains. The primary purpose appears to be SEO manipulation or the distribution of further malicious content through these linked PDFs.

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://trafftec.ru/strik?utm_term=the+adventures+of+tintin+2011+cast PDF link annotation
    • https://bajevopado.weebly.com/uploads/1/3/4/4/134456845/tunefofu-nibowalelara-kujokegarilati-runebuwiwuwi.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/1575072.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/742852.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/98315878c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406809/normal_5fc22914cacb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470825/normal_5fdbec77a66e0.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/e4Mjdq0/duck_hunt_game_dog_breed.pdfIn PDF document text
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/3460744.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/fitureji_benonudurivel_vunodekuvos_xapilirav.pdfIn PDF document text
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/5091773.pdfIn PDF document text
    • https://jivarogogujuno.weebly.com/uploads/1/3/4/5/134513891/170d74541.pdfIn PDF document text
    • https://doduvubilomav.weebly.com/uploads/1/3/4/8/134861128/kekifunusagiserun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00017f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F4D 5412 bytes
SHA-256: 9562a7f1af1f3f64b488989a36cbbfae3322a6c072b2304c5af53c65dced2a55
font_01_sfnt_off000191bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191BC 11892 bytes
SHA-256: 83990e0289614625b082efe757b8f02111f6470ea8c92bd080174760ac9fddf7

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