Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9abfd36efffc69…

MALICIOUS

PDF

73.1 KB Created: 2021-03-17 14:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 507a91cc493e0ff2cd70d0345e3d6eb7 SHA-1: c931d94b016602e154a94a5805f2c3f00db307ac SHA-256: 0c9abfd36efffc69c6d4db00d96b3f172e1da7a0c2b2fceaaf032ac85c530e07
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=hubli+weather+report+today PDF link annotation
    • https://maruvape.weebly.com/uploads/1/3/4/8/134854924/8845402.pdfIn PDF document text
    • http://legalvictory.group/bolojunemodugq6kmw.pdfIn PDF document text
    • https://gafojeted.weebly.com/uploads/1/3/1/4/131452963/1478407.pdfIn PDF document text
    • https://vufomugivubi.weebly.com/uploads/1/3/5/3/135350936/1317461.pdfIn PDF document text
    • https://pipenuxoj.weebly.com/uploads/1/3/1/4/131406698/dimiki-gavunewox.pdfIn PDF document text
    • http://iranomics.com/osrs_ironman_1-_99_construction_guidemojnb.pdfIn PDF document text
    • https://dapasubasawesol.weebly.com/uploads/1/3/4/3/134383907/xikujelun.pdfIn PDF document text
    • https://zeloseko.weebly.com/uploads/1/3/1/1/131163733/769086bb8de277.pdfIn PDF document text
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/nimozabedosesor-duluvoxi.pdfIn PDF document text
    • http://begemotiks.space/things_fall_apart_proverbs_worksheet_answersvupb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_372bd810551647b9a138732cee00683c.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_3f44d019fd4f4e85b0a95482807def8e.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_a0247840e65a4d8984f76946947366d5.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_8de7994a6bf24505aa0f5992d1012ef5.pdf?index=trueIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_bde757cd15e547408411194e0cfdf8af.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_a5a6e454a2f34be1b320edcae4bc9446.pdf?index=trueIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_33091a3c53ea42b68b51674cab668f5d.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_412d5e997fc34d1bbc8e7c31d13d1df4.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_5ce35f596da04047802edbee663f8a42.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_a3547b8cc0b3428f9d0cb7bbf4119cf1.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_3b5485df7cdf4e409cbb72e53f6112ba.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 5164 bytes
SHA-256: 32edd88aace93c4cf8d02e0b18afffbf90c7040206e0a94e60a7c817a87e998e
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10536 bytes
SHA-256: 1d0076c104890aa130bb3410d24d76879b8bf6b053501cca615eec2a6fa6731b