Malicious PDF — malware analysis report

Static analysis result for SHA-256 f845b1c508224807…

MALICIOUS

PDF

76.9 KB Created: 2021-03-08 20:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f5bfa168d28a5ca4697b7b62f21651 SHA-1: 252e91e44ef812e1b774d1cb85bd0c4aab2041d1 SHA-256: f845b1c508224807a46908ac887e60c6f99b7a8f2efc00d67729875497b1fd44
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a large number of external PDF links, suggesting a link farm or distribution mechanism. The embedded URLs and the PDF's structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

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-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://botokaw.ru/123?utm_term=carnatic+raga+notes+pdf
    • https://cdn.sqhk.co/baruduwege/jhigehe/zameduziminuxogivubiwa.pdf
    • https://cdn.sqhk.co/tuzojivemepe/gjjeX4I/53833238495.pdf
    • https://javisifuwo.weebly.com/uploads/1/3/5/3/135304639/bd30801b67e.pdf
    • http://cenderaoriginator.com/simpson_pressure_washer_hose_repair_kitpy3tq.pdf
    • https://cdn.sqhk.co/wofazexej/cYsvLFs/mixogazexosi.pdf
    • http://kanaxade.mygamesonline.org/30425147842.pdf
    • http://redtea.space/tewegusemubajojagisixopiojb98.pdf
    • https://gemonozuwusub.weebly.com/uploads/1/3/4/1/134131657/ximifoside.pdf
    • http://dosijefa.mypressonline.com/34636376303.pdf
    • http://mattelipsticks.site/85459510071uv8sx.pdf
    • http://itawomen.fun/paracord_handle_wrap_instructions5ol74.pdf
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/1e9d56.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9f80c865-2142-4de8-864f-3ff87c66d5e6/tork_outdoor_lighting_timer_manual.pdf
    • https://uploads.strikinglycdn.com/files/30df60e7-8fbd-48f5-a36f-617257cdb0c2/poxiwimus.pdf
    • https://uploads.strikinglycdn.com/files/29b3bc3b-76e0-47b0-8324-8146e5538a28/whats_a_rag_doll.pdf
    • https://uploads.strikinglycdn.com/files/93acb3a3-c5a0-4cac-865e-716f8c8aacaa/harry_potter_and_the_half_blood_prince_book_plot.pdf
    • http://koduwutuvage.onlinewebshop.net/50264707270.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_off0000ed8b.bin
1458caa58ed85c4f77d074fe360f3357f605a62d0d026b881561a1ea964edf55
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 5196 bytes
font_01_sfnt_off0000ff45.bin
58164bffe2609d6c2742313e3ff14cdf2066da2d6cdbad6f937aec17d86457ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 12136 bytes