Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd4da3686f6c516…

MALICIOUS

PDF

74.0 KB Created: 2021-02-24 01:13:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8751943f0f11c0ccc1dcb6e847dc67c SHA-1: cffd1f4953486844863a1ba7c9e3fd660225c9fb SHA-256: bbd4da3686f6c51618d13a6194ba3302b46f6eefbd0a98aaad00708d2a5e1e2c
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'Windows 10 fix' for an 'unexpected store exception error', which is a common social engineering tactic. It embeds a URL that likely leads to a malicious site or further payload. The ML classifier and ClamAV detection strongly indicate malicious intent, and the PDF structure itself is flagged for suspicious characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://bologen.ru/wix?keyword=unexpected+store+exception+error+windows+10+fix
    • https://cdn-cms.f-static.net/uploads/4458614/normal_5fd10d7fa9fc2.pdf
    • http://masterpowerpoint.com/strategic_brand_management_kapferer1n3ng.pdf
    • http://akfb.online/epigenetica_zanichellikmmjm.pdf
    • https://cdn-cms.f-static.net/uploads/4495413/normal_601f55a530ccb.pdf
    • https://cdn-cms.f-static.net/uploads/4424981/normal_60200605cb976.pdf
    • http://ratebekanolaja.22web.org/dufujubunikusevoneporaje.pdf
    • http://doweryklkq.space/62677498580cx2m4.pdf
    • https://cdn-cms.f-static.net/uploads/4493553/normal_5fd93931d4a92.pdf
    • http://familyit.pro/90062247317yfhpe.pdf
    • https://cdn-cms.f-static.net/uploads/4379603/normal_6011d6a92f9d1.pdf
    • http://vsspb.ru/25192366122r2t0p.pdf
    • http://like-store.site/87857491243tkrxn.pdf
    • https://static.s123-cdn-static.com/uploads/4383698/normal_5fdf49f9a02df.pdf
    • https://cdn-cms.f-static.net/uploads/4374953/normal_601314c866ec9.pdf
    • http://parrrtner.xyz/777623456775v476.pdf
    • http://xobuxok.22web.org/halal_industry_development_corporation_annual_report.pdf
    • http://zeraseb.66ghz.com/gebekumubifufamez.pdf
    • https://static.s123-cdn-static.com/uploads/4369502/normal_5ff5ead637ffc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wiraxoxepopiret.rf.gd/best_birthday_wishes_for_boyfriend_video.pdf
    • http://wuzuzifo.epizy.com/acoustica_mixcraft_7_free_crack.pdf
    • http://duxegevonuzevuj.rf.gd/canon_ip90v_pixma.pdf
    • http://wuvuwipiwizovid.epizy.com/ropuleganokabebil.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_off0000e548.bin
f9a664bd9cb55c5fb1583937c6987defa1e2916d9b7418e4b73371ab7dbec6ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 5252 bytes
font_01_sfnt_off0000f75c.bin
2d05ccf664c7e9a846a58b4382639c5ff6fcf53636f26d3ff607296ae8832667
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 10164 bytes