Malicious PDF — malware analysis report

Static analysis result for SHA-256 081f7f39e1226876…

MALICIOUS

PDF

76.5 KB Created: 2021-06-01 13:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e1397666fc1a9ba94184e144ec9e51aa SHA-1: 4a1bab173019e8c26598317da407a083512943c7 SHA-256: 081f7f39e1226876d2e88bd79f7f486e89f342c958d2296aff6995c5bd6af638
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious redirection. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/pbw?utm_term=how+to+choose+double+wear+foundation+shade PDF link annotation
    • https://fazotevepokok.weebly.com/uploads/1/3/4/8/134865813/tibinomike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fdfb7f53cb26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_606015926fef1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5ff8018a8b104.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/gukejelajus_lixeviso_ziwamuvefosek_lelureruwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467927/normal_5fef404a6e6b2.pdfIn PDF document text
    • https://lawejuja.weebly.com/uploads/1/3/0/7/130740077/1e9067488.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/b558753da54f.pdfIn PDF document text
    • https://karopokonu.weebly.com/uploads/1/3/4/5/134519394/8f0064a5c.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/basijij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_6040e8e55bd6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465400/normal_6046a47910740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_605a78188017a.pdfIn PDF document text
    • https://taboloralo.weebly.com/uploads/1/3/2/7/132741194/a8876.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/ad0662.pdfIn PDF document text
    • https://tufefuru.weebly.com/uploads/1/3/4/6/134621659/panusano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144452736/how_long_do_you_cook_a_corned_beef_brisket_in_a_pressure_cooker.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/solved_arabic_characters_are_disjointed_and_reversed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d94c8e2-f213-4f0e-836e-346e76f98e78/the_crack-up_fitzgerald_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9f65c4-19c5-460e-a750-6fc02c4b63c1/vazetibetedugasan.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426549/vevalosinagozisawige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e0371b-c879-48d3-8b23-da04ebe1665f/zavotoludi.pdfIn PDF document text
    • http://padimagofo.pbworks.com/f/jenebepuvewin.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_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 5304 bytes
SHA-256: c6ce13e8882cb531ad9a8c40f3b1e882c8d084fd8483257379d2ef5fbd1c5f86
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 11244 bytes
SHA-256: cca1c5ddf30e3bc2e9464218824390dd21a11ee2e06af46ea2c8ac9208bbd71d