Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bc431d806fb64a…

MALICIOUS

PDF

115.8 KB Created: 2021-03-27 21:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c204962f6bf8efca5fa49974bfffc90 SHA-1: 78d919b63b454726eddc940afe42862714926f37 SHA-256: f8bc431d806fb64ad4a25178c1d7de2cb91e6b859433feaaf6b9c73205978f7d
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to 'novel best seller romance pdf' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure. The presence of an external URI pointing to 'baarspo.ru' further supports the phishing attempt, likely to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://baarspo.ru/award?keyword=novel+best+seller+romance+pdf
    • http://pemowovamig.iblogger.org/rekovexotilebizusu.pdf
    • http://vkysnaya-eda.site/relezak4x2l3.pdf
    • http://wikowezenitezo.medianewsonline.com/61137246526.pdf
    • http://zokabuxekego.22web.org/39803169031.pdf
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fceae5a3451a.pdf
    • http://buwubaled.mywebcommunity.org/rorosupuxesazezidade.pdf
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fe5600483112.pdf
    • http://levelupguild.com/93664437174fo4c8.pdf
    • http://finipupote.mywebcommunity.org/46085898799.pdf
    • https://cdn-cms.f-static.net/uploads/4467298/normal_6040c42e45ec6.pdf
    • https://cdn-cms.f-static.net/uploads/4384143/normal_601139a21067c.pdf
    • http://dehydratedoriginalgoodness.com/62746804998f8g1d.pdf
    • http://powerhdniy.space/wusasodson6u.pdf
    • http://formblckr1.xyz/482012726928lr8f.pdf
    • http://pitetivedu.iblogger.org/warrior_cats_website_games.pdf
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fd7def6d190c.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vomemozasaz.rf.gd/nccn_guidelines_hodgkin_lymphoma_2016.pdf
    • http://suwuxuk.epizy.com/jayce_guide_s9_top.pdf
    • http://jumepenitujox.atwebpages.com/coast_guard_gar_model_orm.pdf
    • http://befopol.epizy.com/html5_template_bootstrap_4.pdf
    • http://darirafid.rf.gd/tarikakanejarelamifiwofi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a6a.bin
cddc9bbb1fa233e3aafde526ac68a5a968eac26b2861b53ff9a49ee492d5c3e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6A 2236 bytes
font_01_sfnt_off00018469.bin
cba316cb7ab386a377b3b082aa05c166a60da3a96f1ccf8e32deee7fa4a9b3e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x18469 5468 bytes
font_02_sfnt_off000196eb.bin
c2072b7135d8abf64c70854521d3f892c478ae3f2c97ae24fa7fef49575c3228
pdf-font-stream PDF embedded font (sfnt) at offset 0x196EB 12820 bytes