Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad407a25a7427b9…

MALICIOUS

PDF

67.9 KB Created: 2020-11-10 18:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2237ce7a7a7e96d436e5a05b6fb5c619 SHA-1: db7e7435e0a09b0ddec9ae0ebfcef3f38a3ed0c7 SHA-256: 5ad407a25a7427b9ad184e68ccc850478307d90873f4596d05522067c7abd5fe
164 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. It uses an invoice-themed lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/123?keyword=sahara+desert+food+web PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5f91294c42c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_5f95138263719.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/jibavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_5f95d4a069925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f97e3547873f.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/zerejibixupav/gikumarofoniroge.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/breakfast_sandwich_maker_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/83840557044.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/35302203615.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/hyrule_historia_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/antenna_theory_analysis_and_design_fourth_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/56960983394.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 5300 bytes
SHA-256: caf689beb7a864da6ecb26b4f9715519458e57f0c452b702a6fe4bc848695fee
font_01_sfnt_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 10708 bytes
SHA-256: 3da17d1363ec51f1448f560752db41c4f7d41a47b9317ac1e1bfbb6d6b1b2985

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