Malicious PDF — malware analysis report

Static analysis result for SHA-256 c973dcea1f4ee39b…

MALICIOUS

PDF

84.6 KB Created: 2020-12-31 07:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 16c82ec0c5e775b4ebe15015ce0e03bb SHA-1: 9539172f2bc45c4a0e83cf585976c4bade661011 SHA-256: c973dcea1f4ee39b9aaf5e241fce1f392c38c78ca94dfaba6ab0d6032e1aae66
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 0.9995

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=american+eagle+tankers+fleet+list PDF link annotation
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/ee3d484850ba95e.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/ehasgcB/electronic_circuit_calculate.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/cQcib8R/voice_changing_headset_xbox.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/xifabilejilab/96949757381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af274705-69d0-44b1-87f1-f5b806be7d9b/movie_theater_in_secaucus_nj_harmon_meadows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0c9c7e-7659-4956-8dbd-8f00232f3165/onn_charging_pad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f0cce8-7f2b-411f-88d9-c055c74c3e45/polumuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42420596-f55f-4fd9-885f-ad5261ca4b48/bot_traduction_discord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6aff58-d209-4a22-b409-532b82808b52/soxasukapebu.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/hollywood_reporter_news_desk.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_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 5252 bytes
SHA-256: 45732463310eea3ec6e44ed68ce4acfc6b15e19468c4044228db859009d0de73
font_01_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 12588 bytes
SHA-256: 3cfcc46638a5a6914ea936b767f2fa628a2cbb6e0754f089d4d4792e7a5085ae