Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c425ca109844090…

MALICIOUS

PDF

75.8 KB Created: 2021-04-02 13:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a4a3b6ee1f956f523ae3aa57f1122fa SHA-1: a36e9e3a5119468d178899dea41fe8672836ee1d SHA-256: 3c425ca1098440901f1428792b9df1f9668259f3cb6ee5b2a8aab3707e610d33
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests the document is designed to redirect users to potentially harmful websites. The embedded URLs and the document's structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=capitalism+2++free
    • http://tebapewulodafe.getenjoyment.net/best_annotation_ipad_apple_pencil.pdf
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/kujeju_nugakizimab_kopebibekitajex.pdf
    • https://cdn-cms.f-static.net/uploads/4464065/normal_601c5d15be47e.pdf
    • https://bazatodeniwumov.weebly.com/uploads/1/3/0/7/130739274/xireruvukin-vagopotirasap.pdf
    • https://cdn-cms.f-static.net/uploads/4369161/normal_6058e2364c720.pdf
    • http://xagakojitogiva.getenjoyment.net/fivededoje.pdf
    • https://rapokivagifo.weebly.com/uploads/1/3/4/3/134338569/wodedumurobajoz_pedepumasateje_pesudula.pdf
    • http://nofubajabuv.medianewsonline.com/effects_of_plastic_pollution_on_environment.pdf
    • https://cdn-cms.f-static.net/uploads/4476925/normal_603dc1b72e630.pdf
    • https://cdn-cms.f-static.net/uploads/4390664/normal_6046257f5b83f.pdf
    • https://fowinojosusine.weebly.com/uploads/1/3/4/4/134495991/xabijaripazo.pdf
    • https://static.s123-cdn-static.com/uploads/4488817/normal_5fcb4bb46bb44.pdf
    • https://cdn.sqhk.co/vusunuvaka/07idPPt/dark_souls_3_quality_build_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fea0fa5b7b44.pdf
    • https://cdn.sqhk.co/rogudokives/cQZiiuG/pooper_scooper_amazon.pdf
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/714105b85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ec1d.bin
83185aa8c28d30146abdbd1cf27f0cab2c5107adf82a0bdad8449174347dabdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 5084 bytes
font_01_sfnt_off0000fd4e.bin
b7e1f420fda160ca755f1b9f7f5792ce1a158af3f091b607f1993d44895b48c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 10996 bytes