Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10d88a99caca70d…

MALICIOUS

PDF

66.6 KB Created: 2020-11-25 10:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dc13224f41b99a912c44754a7c29933d SHA-1: d9a413021a5d9c5e0002a3afd05d942289a21434 SHA-256: e10d88a99caca70dc3e9a10a6580c68c1f9e0196f45a6deba222f66d60688faa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafffi.ru/123?utm_term=graph+of+csc+inverse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8decf35c4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f8f53d5862fd.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/davadinizaxijefit.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/salosibejodod/zejewivazu.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/sapagami.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/clementina_suarez.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/wexabojibewawexutu.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/all_in_one_toolbox_pro_apk_rexdl.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/cool_math_games_run_33.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/21053553618.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/swtor_recommended_system_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/kegesuwilojovopi.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/11130945856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333d329e-9c88-44f7-bfc8-a763332444d7/98505407816.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/cable_tray_installation_method_statement.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_off0000c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 5164 bytes
SHA-256: 30386de2649eb16f4a4355ecf9f2e937a102f1f1aa7d914658ee34377f4207c2
font_01_sfnt_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 10844 bytes
SHA-256: b6b6d6f8c4acd9ef30f652a3a978802342e636d6dc17b8f43456e8094fa16a2d

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