Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c42a782c0dd7681…

MALICIOUS

PDF

72.4 KB Created: 2021-04-07 15:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e0270dd2cf5359e445a75e27224db7d9 SHA-1: 585c24775403026563c5d258535f90874fc469f4 SHA-256: 9c42a782c0dd7681fd83168d22a0599ea782760b09d8060c601a84c843aa9e8a
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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, 'https://dafemum.ru/strik?utm_term=weber+kettle+grill+grates+amazon', is presented as a search result, indicating a lure to drive traffic to potentially malicious or ad-filled sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=weber+kettle+grill+grates+amazon PDF link annotation
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/3344735.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/igc11ie/4599066856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_603aeda866652.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/gegiige/stiletto_nails_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/gEgghic/10253659678.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387918/normal_60088b33ede55.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/mpdf_library_codeigniterfqqyi.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/rixeratujisu.pdfIn PDF document text
    • https://tikobivit.weebly.com/uploads/1/3/1/3/131382680/7746705.pdfIn PDF document text
    • https://cdn.sqhk.co/xonafelog/jbPcchf/28206604538.pdfIn PDF document text
    • https://tuzupenaxu.weebly.com/uploads/1/3/1/4/131454165/f19bc5ef98.pdfIn PDF document text
    • http://mikrotikwizard.com/runipokagixk3jq4.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikeraz/Djb6Egh/my_plants_evolution_your_pocket_garden._com.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_42cd61728b7d414f90de1b51a975090d.pdf?index=trueIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_f40f268944d64266b60b6b18f0497052.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_a2cad50a9f894f74884c803f1290b96d.pdf?index=trueIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_fffb6a9fda704567849b442dc75563ba.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_61ad37c8c618421dbab15b0a456523f8.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_e11c3527e14c412cb4cd3623d7855136.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 5272 bytes
SHA-256: f6813cf01d7639690fedd7d3721bc686c4c88ed522d976c266e04c77c775ad36
font_01_sfnt_off0000eca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 11108 bytes
SHA-256: 71d139be779907ba621a787c26a4e596adae885871c2cc1df26ccb5c9d4fdff8