Malicious PDF — malware analysis report

Static analysis result for SHA-256 f444c19ebe2e1303…

MALICIOUS

PDF

76.3 KB Created: 2021-03-01 06:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9d1d01355830668e1c19ecc3b80e7b29 SHA-1: 8b9312ef387c188d449ba8b3e82096e48c75bff7 SHA-256: f444c19ebe2e1303e728fc3db35a8732a1e7f7e89d57772b2bfc60b116cf2292
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, one of which points to a potentially malicious domain, suggests this document is part of a phishing or spam campaign. Although no scripts were directly extracted, the PDF structure and link farm heuristic point towards techniques used to distribute malware or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=diamond+sutra+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365653/normal_600dfad12f5ed.pdfIn PDF document text
    • https://wiluxuvofox.weebly.com/uploads/1/3/0/9/130969019/1958504.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/zakej.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/gokixelijovuvopi.pdfIn PDF document text
    • https://lonumuzab.weebly.com/uploads/1/3/4/2/134234730/ea21363a4e6f9.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/broadcom_ush_driver_e6520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/rekibesubukipozubituzerok.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/31460581164.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/the_swatch_group_ltd_annual_report.pdfIn PDF document text
    • http://fejagokebaneril.epizy.com/luzikita.pdfIn PDF document text
    • http://xomexopiguv.rf.gd/cbse_improvement_exam_2019-_20_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/voxif.pdfIn PDF document text
    • http://damikofem.rf.gd/honeywell_wireless_focuspro_6000_system_kit.pdfIn 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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 5064 bytes
SHA-256: 8d51d80b3b546081aae856a248dbeb2f20fe88704341035370e99e84c4ec15a2
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 10316 bytes
SHA-256: a741cce20e46b23d451843d99c0850d16c693f0189b77bea077c9e22ae3163ff

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