Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7fb47c1222e819…

MALICIOUS

PDF

82.6 KB Created: 2021-03-17 23:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7643be505cdb405aa37f7b00dac49d0a SHA-1: 54d47c28f928dd51068d757b9ff6e3da29dbb43b SHA-256: ea7fb47c1222e81912a11e37a71a3995b7f30d8e2a27919f81a9025538b7a62d
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The document's content, though heavily obfuscated, appears to be a lure related to firearm guides, likely to attract clicks to these malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/wix?keyword=saiga+ak+47+bullet+guide PDF link annotation
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/7253091.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/wekop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fd2896a79e16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403940/normal_5fc8538118a8e.pdfIn PDF document text
    • http://geloritiveda.mygamesonline.org/61327739945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_602dd48e95bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390069/normal_602d221e62f45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5feaed67a137b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_60256b23e2975.pdfIn PDF document text
    • http://wizapivizesib.mygamesonline.org/49512010283.pdfIn PDF document text
    • https://nemoderi.weebly.com/uploads/1/3/2/3/132302766/0dd91bf6ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_604ead89c58b9.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/articles_of_organization_md.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481061/normal_601f8f7b1ddfd.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/8588095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_60394ed41aeb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_5ff3a1b647d44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_60010b9a1bd46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_6d6aacb71bb2421198246ec42e8c3207.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_5dfa51f477784ae891f2e174aa64f22b.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_10f47848610a4e83a6e20ad7dfe7f067.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_e70c94b98ca94c60a3bc598dbc6eebf2.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_off000102bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BF 5196 bytes
SHA-256: 3dfe3503f82fe06ca17fcbf465ec9867624fe8e800629e8f8d5166129406d2b3
font_01_sfnt_off00011490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 12464 bytes
SHA-256: dd6815e7cfd8b39046880806f2c865aeeca07d47c0c5539179d511d7f6033ede