Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2d567d0923ce51…

MALICIOUS

PDF

81.4 KB Created: 2021-03-17 03:11:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2f37b38c55c5a9e5ae6c2ab70ebfe428 SHA-1: 0c1cb4d506bed16423f70c93edb50265d9b77136 SHA-256: aa2d567d0923ce51d8851fe7da0f5c044de12ed761a0c0e1122f1e2dbfb0a673
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/123?utm_term=falciform+ligament+divides+liver PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393369/normal_5fe08de42b52d.pdfIn PDF document text
    • http://futup.ru/54453072967r7a28.pdfIn PDF document text
    • http://streamsweets.com/zaxopx8yol.pdfIn PDF document text
    • https://cdn.sqhk.co/lajazufuzu/daxicha/21640263342.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/jh0Bthi/archer_season_11_hulu_not_showing.pdfIn PDF document text
    • http://business-open.online/jatimebagewixomujwn.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/2480289.pdfIn PDF document text
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/togewe-suxoruvosimus-tikubozevajog-vusefe.pdfIn PDF document text
    • https://bidiruvinevuf.weebly.com/uploads/1/3/1/3/131379477/bafujulugi-dunax-rinivirigo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482027/normal_5febc6e0e100d.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/producer_agreement_contract.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/susawajilazimaditeto.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/standard_bolt_sizes_metric.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383916/normal_5ff7d2cd7cf9f.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/2013_dodge_avenger_serpentine_belt_diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_2fba5fc5bb144e9991c1d859830cac0e.pdf?index=trueIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_257757854432447fa81d6bb677eb94a6.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_c606625566ec42aca28e2ffee13c4ee4.pdf?index=trueIn PDF document text
    • http://novupomajanox.atwebpages.com/can_t_hurt_me.pdfIn PDF document text
    • https://2cc12256-1025-444a-bacb-901a9f007bda.filesusr.com/ugd/d1fcfc_1df966bf93cd4b2db7aada923dd8d615.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_144f5a8e917d4906a36e9ecd23e217f9.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 5356 bytes
SHA-256: 113b9ad345a9bb331d5d77c8aedce809296ee5879a3f2a5acc4e04d61a38c24c
font_01_sfnt_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 11200 bytes
SHA-256: 6c1301c6750bfd0368974b54ae027efeced2fa26a2b76b06bf1860fe0774cc2e
font_02_sfnt_off00012361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12361 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7