Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3935aa7d322cd8…

MALICIOUS

PDF

76.1 KB Created: 2021-02-25 09:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5c10492eacf8ff6093a0d2d2ab417fa SHA-1: b09f63e3093d20345aa27de49bab0b012dca4cd3 SHA-256: 1a3935aa7d322cd8e1e2fb92a21950c87b6e0e48bb6c36e7107899a789dad774
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?utm_term=cyberpunk+red+character+sheet+example PDF link annotation
    • https://juwudusufutibor.weebly.com/uploads/1/3/0/8/130873872/zuxetanariwolen.pdfIn PDF document text
    • http://zajifokabatu.iblogger.org/lazalutuvazalumezi.pdfIn PDF document text
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/8447959.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/gfihthf/vowipiwudibu.pdfIn PDF document text
    • http://fudidudigas.iblogger.org/bexugupuxog.pdfIn PDF document text
    • https://xenonomexe.weebly.com/uploads/1/3/5/3/135386884/433a79052.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/pennywise_laugh_ringtone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/liluvad/nayak_assamese_movie_video_song.pdfIn PDF document text
    • http://siwupogogu.rf.gd/music_sheet_symbols_piano_reading.pdfIn PDF document text
    • http://ravesezubepad.epizy.com/jumakuxixaluvu.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/lizavabumapinatolu.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/kilexexemubugoneganiruv.pdfIn PDF document text
    • http://tosaxope.rf.gd/10011931769.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/autodesk_inventor_2017_user_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 5436 bytes
SHA-256: e47ffebd62355aba6b27d258b8baf501548f4d175b0e54f538db553bafc5e7a5
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 11524 bytes
SHA-256: 22979f625d414f01fbbc7063bd0b9109386cf57b51b7124fa91f515216f7e773
font_02_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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