Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe3169904e7f4a5…

MALICIOUS

PDF

77.4 KB Created: 2021-03-15 17:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 158263691128822adcd87942dbcf8528 SHA-1: 99e5b277a404cdb57a35e296fd50c2134ac15dee SHA-256: fbe3169904e7f4a581bd616d5f59d1e0674b04389cb1594a78f156bf125e6500
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are to PDF files, suggesting a link farm or a method to distribute further malicious content. The primary malicious URL identified is jumiwimov.ru, which is likely used to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/award?keyword=el+muralismo+mexicano+eduardo+subirats+pdf
    • https://cdn-cms.f-static.net/uploads/4404133/normal_5fdc4ae5e5da6.pdf
    • https://static.s123-cdn-static.com/uploads/4367308/normal_60089a55b638d.pdf
    • https://xatuzagu.weebly.com/uploads/1/3/0/7/130738971/gizujaposedox.pdf
    • https://static.s123-cdn-static.com/uploads/4417137/normal_5fe0bd96096c1.pdf
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/ef98e.pdf
    • https://xasevezivim.weebly.com/uploads/1/3/5/3/135302984/188077.pdf
    • https://cdn.sqhk.co/gufemazibafi/ghj2j7w/sonic_the_hedgehog_wallpaper_1920x1080.pdf
    • https://cdn.sqhk.co/ruwonumatag/jefzfji/lalobef.pdf
    • https://fotularujofo.weebly.com/uploads/1/3/0/7/130739653/bexuvasivibu_movaranojom_zewemis.pdf
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/479482f9c4.pdf
    • https://cdn-cms.f-static.net/uploads/4451047/normal_60215ce128356.pdf
    • https://cdn-cms.f-static.net/uploads/4375357/normal_6035ebae0e03c.pdf
    • https://cdn-cms.f-static.net/uploads/4418199/normal_5fe85629acea1.pdf
    • https://cdn-cms.f-static.net/uploads/4403543/normal_601f2c83e7404.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_1e51699d892a4387a67e0c07cc58f189.pdf?index=true
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_8b9bda30c773463da0b77dd9540a5998.pdf?index=true
    • https://s3.amazonaws.com/lekizopiloref/timeline_google_drawing_template.pdf
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_c87cbca1365e4e01befe3249c630015d.pdf?index=true
    • https://s3.amazonaws.com/pibabopuduj/1468057348.pdf
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_0f36107117e440b1a568740a99a8b391.pdf?index=true
    • https://s3.amazonaws.com/gaxuremewuger/crazy_frog_2_game.pdf
    • https://s3.amazonaws.com/lorerexeg/jio_rockers_tamil_hollywood_movies_2019.pdf
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_e322594f3c644510bb6cad10ff313223.pdf?index=true
    • 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_off0000ecf8.bin
f7554506ecb0e1f6f37a68f18d0f230623411ae1f658513c41110a308c05d36a
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 5464 bytes
font_01_sfnt_off0000ff73.bin
d98caf506a0e36ec70b7cbfa7de5c10622d3101510eab56b589c485370aa6321
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 12032 bytes