Malicious PDF — malware analysis report

Static analysis result for SHA-256 871eca85f47c826a…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 22:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a24218b0b0d753d123b9f031240be5a4 SHA-1: d747d23eaf5af55bb60122f6e2c2989f18471cde SHA-256: 871eca85f47c826aad3d93827db27a412e10aff0547f338db32d0e0326587231
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially malicious websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to direct users to external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/aws?utm_term=carson-dellosa+cd-4301+pdf
    • https://vekowafonomi.weebly.com/uploads/1/3/4/6/134692424/8687843.pdf
    • https://static.s123-cdn-static.com/uploads/4476596/normal_5fcdf45a2e014.pdf
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/kawuwoxedox.pdf
    • http://worameruvejaka.mywebcommunity.org/sat_subject_test_biology_score_calculator.pdf
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/067f4831608b9d.pdf
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/9062402.pdf
    • http://lipexifinidoda.scienceontheweb.net/62561703800.pdf
    • http://padojobimo.mywebcommunity.org/movinerarilitibomaj.pdf
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/solak.pdf
    • https://cdn.sqhk.co/fuwufupi/K5vjcqQ/mipoluvusiripil.pdf
    • https://vijujaluju.weebly.com/uploads/1/3/2/7/132741375/8029795.pdf
    • http://bexowobiminefi.mywebcommunity.org/99456522642.pdf
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/28db4cad05.pdf
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/1911774.pdf
    • http://jolidulikan.scienceontheweb.net/collective_and_abstract_nouns_worksheets.pdf
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/5891bea81d3ef0.pdf
    • https://cdn.sqhk.co/siwowoso/5EUehgF/exploration_definition_and_pronunciation_of_scion.pdf
    • https://cdn-cms.f-static.net/uploads/4413843/normal_601ecb8ee0b5d.pdf
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5fe0cb7115c4b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bavatesivo.myartsonline.com/33189631726.pdf
    • http://tebaputazaxuva.myartsonline.com/reflexin_sobre_el_mito_de_la_caverna_de_platn.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_off0000ea63.bin
b855c7d43c74ef6655d9cbe6ce3ebb3b50164e342659252bda5867c1a3a7cd61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 5532 bytes
font_01_sfnt_off0000fd4f.bin
0a3714bf42fb3003c21db1052857e407363bf9cfc58990b0abcaa7f3429522fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 12172 bytes

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