Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ccff3ae61d07b2…

MALICIOUS

PDF

84.1 KB Created: 2021-03-17 16:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 909dd2808eaafeeefd8b52bea7ac50b5 SHA-1: d02ccc2d43b53fda4918cf5ddd8326d0065cd880 SHA-256: e3ccff3ae61d07b2372cf363c489b1a0b5cee230d7c7f3876c06a8820e28f5b0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs indicates an attempt to lead the user away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=chief+information+security+officer+salary+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414174/normal_5feb41c78c3c0.pdfIn PDF document text
    • https://mibomawategufu.weebly.com/uploads/1/3/4/5/134584653/d174bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_604f07cb623b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469831/normal_6009201d4fa9c.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/khjjdhb/70173472846.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/cjgNgj8/retofokanaxotometidawixe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460230/normal_5ffaa9521367e.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/7132000.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/eWigheQ/zombie_survival_3d_hack_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_6013e4f58d5d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_6043d69f84312.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/0546ddee125da8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_600fe75ebf0d7.pdfIn PDF document text
    • https://rojabufofunos.weebly.com/uploads/1/3/0/7/130776514/lojipabesapofid.pdfIn PDF document text
    • https://jomefexud.weebly.com/uploads/1/3/4/7/134732593/sonogipituzofil_radotopup_ruluzivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_60512ce2a6aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_60340e058d760.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/web_template_psd_vector_free.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_8a34a98b25e34fcdb5987c98c8cf67a3.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_4520ee0977684c72aab0f74c3384017e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regovadeje/87590219385.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_2a8ab2d61b0041d5a7ce9adc3d228b5f.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_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 5612 bytes
SHA-256: 35c1c5fd2d3cd8d1951ec39f95b39f451b44a1b365226b9cfe2586253b3ad6c2
font_01_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 11112 bytes
SHA-256: c56c72a21cdf40b11653cc53fb52dfd35e6901c3ca441b79a272abdcacd2c9ae

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