Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb9c152127f1a0…

MALICIOUS

PDF

69.9 KB Created: 2020-11-20 18:34:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ee0d273f5e58e8bbde9230ce2711ada9 SHA-1: 1748001e899fdd386793bbd7c496b29b887910c6 SHA-256: 73fb9c152127f1a07d1e3bbfc4b665370b27fd7e93ed930e2750180f88331ba8
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 0.9997

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://trafftec.ru/123?utm_term=dmv+practice+test+2015+spanish+nj PDF link annotation
    • https://gufavugowiguxu.weebly.com/uploads/1/3/4/5/134590320/da17ecec.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/8bb7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5fa1c528691c5.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/risisipajole/gedugejefajeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9def3037-596c-41e4-8489-966fd8273331/josh_games_stick_rpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6344d48-db79-4f1d-b9db-1aaccad64893/60895041827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85080ee5-9c40-475f-acf7-689435419a3a/15961734502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/880ee4e8-c1ac-4dfa-82c5-8bc6eb4152d1/19615616515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa129d75-02a3-4a8e-84fb-582b8808cb98/wanejuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fab076-ea48-475c-b14d-6a3f33144e5d/tazinonopep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1973cb30-f07c-42c3-ade4-36830adf9ad8/boruxigilajam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d2d9ab-cddc-4568-a4db-b3e2af780772/kpss_kitap_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89782de7-e290-4ae2-8285-dde00d00e7de/97125818978.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_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 5724 bytes
SHA-256: d12dd3829ba8e8cd64875fe16a0835f6b9bcab4ecf90329929f1fae074e39046
font_01_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 11116 bytes
SHA-256: 74153b2b52dd0998205b9b1bb05e89c9ddc1c6d122179d1b055d8c244ca4eaaf

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