Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbca1e73118664e9…

MALICIOUS

PDF

67.1 KB Created: 2021-02-24 01:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a201fcae655a195f6616e40e3b367788 SHA-1: b4bd5633659e411efb121d2ea33232fa7864353d SHA-256: cbca1e73118664e92345ca14e365451af2ba0b587ffa210ebfc312d718bef0fb
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. It contains numerous external links, with one prominent URL pointing to 'seumenha.ru', suggesting a phishing or SEO spam campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=chemical+bonds+worksheet PDF link annotation
    • http://doucheop.xyz/cg_police_physical_admit_cardp3w7x.pdfIn PDF document text
    • https://fibepuranes.weebly.com/uploads/1/3/4/0/134041348/domamefibegaduwuxo.pdfIn PDF document text
    • http://cmbclientes.com/vamalemoxisuserevopagi1gz.pdfIn PDF document text
    • http://jopkapopka.online/kuvavakixupil7ezsm.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/nefomojuwet/33975738116.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/cloud_computing_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/10948090261.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/morefixoferetowilimofoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/70334925378.pdfIn PDF document text
    • http://gavonita.epizy.com/limemanevolagow.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/nesidoja.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/23863057943.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_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 5380 bytes
SHA-256: 76b1e4f1e3248394beb475cdd92049be1bddf4ef38a9b067890d36cf02ae1092
font_01_sfnt_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 10252 bytes
SHA-256: 830e6fc49dfbffc30b10b2b713198faebc03e7b1be31cbe397445a9790549fb0

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