Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3388b8c88302080…

MALICIOUS

PDF

82.6 KB Created: 2021-03-04 21:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e373e8521a624664077810c2886bc1aa SHA-1: dc8e08ae95f1fa7fc6c3c17facc5d9b77f84c1d9 SHA-256: c3388b8c88302080bd5ec81dc9dc1c571e67e1855542309b68e345adf9d30489
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely a lure for downloading a malicious payload. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan-like behavior. The document body, though heavily obfuscated, suggests a pretext related to computer drivers, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/aws?utm_term=optiplex+780+windows+10+audio+drivers
    • http://xelasurugopu.mywebcommunity.org/uses_uracil_instead_of_thymine.pdf
    • https://static.s123-cdn-static.com/uploads/4454299/normal_5ffb65ffb7645.pdf
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/madefovoko_vogori_telusina_xapixo.pdf
    • https://cdn-cms.f-static.net/uploads/4489244/normal_5fd2c6152a5c1.pdf
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fdcc8723ccdc.pdf
    • http://moneymaya.site/autocad_2d_house_designewkx6.pdf
    • https://nasaperexi.weebly.com/uploads/1/3/5/3/135351481/4084352.pdf
    • http://torchqbfl.fun/family_chantel_recapv5rjc.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6025c90a8da28.pdf
    • https://cdn-cms.f-static.net/uploads/4428329/normal_5fe9ba7fa58d0.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/effective_half_life_time_calculation.pdf
    • https://cdn-cms.f-static.net/uploads/4376105/normal_6010fcc08d44f.pdf
    • http://clyb-wylcan3.space/74993906020b2y4r.pdf
    • http://shoppermarket.online/fozebufubij3vt0a.pdf
    • http://wamuwosola.mygamesonline.org/84736364943.pdf
    • http://bella24.xyz/japelepazav1tk0g.pdf
    • https://zojipulororasa.weebly.com/uploads/1/3/6/0/136011419/weliro_jijewufumu_jujofelemona_baderape.pdf
    • http://wejuzofibab.medianewsonline.com/6717628079.pdf
    • https://cdn-cms.f-static.net/uploads/4483602/normal_603d54197bb83.pdf
    • https://cdn-cms.f-static.net/uploads/4480161/normal_60190ccfb6f50.pdf
    • http://zegererevez.medianewsonline.com/65967771343.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_45f1d88c2ba04530addf57a716c8d7ad.pdf?index=true
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_4473fdb0595f4ec79d0479d9a95adab4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72e.bin
1fd53f6eb5451e6356ab4fc79ed26fc02a172b68801c53abfc74f137ed34d960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 5552 bytes
font_01_sfnt_off00010a3a.bin
519f12c0d3c82088b98a7a2a82d5fea00874b29f1a6ec0ee0afe6ad1eb65ed6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 10672 bytes
font_02_sfnt_off00012e95.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 4324 bytes

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