Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11a3ffe7d044e61…

MALICIOUS

PDF

66.2 KB Created: 2021-03-26 00:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb2bd5431d9b67c611ebb63f969715b9 SHA-1: 1d37cf75280c12745ca37960bb208fe6b7a0295f SHA-256: d11a3ffe7d044e6173306a10add3af5977782a9c01ac25cec5c9177f4e00171d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host numerous external links, with a primary suspicious URL being https://jumiwimov.ru/strik. This pattern is often used to distribute malware or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=ew+kenyon+identification+youtube
    • https://cdn-cms.f-static.net/uploads/4501998/normal_5fe69e5eebdc3.pdf
    • https://cdn-cms.f-static.net/uploads/4403533/normal_603421a631e1d.pdf
    • https://cdn-cms.f-static.net/uploads/4486363/normal_6040b1d1da77e.pdf
    • https://mototide.weebly.com/uploads/1/3/2/7/132710683/ritezovulisuso-fizufubevu.pdf
    • https://cdn-cms.f-static.net/uploads/4468268/normal_6056537ddc498.pdf
    • https://cdn-cms.f-static.net/uploads/4486053/normal_601ebe4e0ba27.pdf
    • https://cdn-cms.f-static.net/uploads/4476147/normal_601eaa4840753.pdf
    • https://cdn-cms.f-static.net/uploads/4366341/normal_601aa2810f75b.pdf
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fd3cc0c0a62a.pdf
    • https://zidifupo.weebly.com/uploads/1/3/4/4/134475425/fabuzixafe-mixasimupijig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pukiza/wewiwidij.pdf
    • https://s3.amazonaws.com/savukojubusum/juviguleluduzavizazataka.pdf
    • https://s3.amazonaws.com/kigavanus/what_types_of_lasers_are_used_for_hair_removal.pdf
    • https://s3.amazonaws.com/lebaxa/86845815944.pdf
    • https://s3.amazonaws.com/jopomodilamego/synthesis_essay_thesis_statement_examples.pdf
    • https://s3.amazonaws.com/fuvidokibet/exterior_angles_of_a_polygon_worksheet_tes.pdf
    • https://s3.amazonaws.com/pazerogasarinu/myanmar_new_books_free.pdf
    • https://s3.amazonaws.com/rewepalazamiso/wawusov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c649.bin
289c29d1178918f7cee4ae3a5fb720e9a78e5983951f5540e3ba292994048079
pdf-font-stream PDF embedded font (sfnt) at offset 0xC649 5064 bytes
font_01_sfnt_off0000d7bf.bin
dd3142b9d8199a8bbd62619d61d820150e6daa46a8985a4d7d221fc4b2c80fab
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 10116 bytes