Malicious PDF — malware analysis report

Static analysis result for SHA-256 929a90da3a973c92…

MALICIOUS

PDF

75.3 KB Created: 2021-02-11 15:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cd31a4c59da083b2fbbae8d5b66171c2 SHA-1: 640995dd2d4278bc24d3e0ccbe5c44ebf6bf4130 SHA-256: 929a90da3a973c92d548bc944b1bc31c4288032d53ff91df39d4ee0475bf5089
186 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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/123?utm_term=strong+and+weak+baes+and+acids PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423155/normal_5ffe0fefb44ee.pdfIn PDF document text
    • https://lipigilukezi.weebly.com/uploads/1/3/5/3/135347924/butufuritaw-tagavesi.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/9855251.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/bPiJRjc/40087362652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_600fa268b6b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_6020da2d871fb.pdfIn PDF document text
    • https://kugavulaxux.weebly.com/uploads/1/3/4/4/134454690/sesebupef.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/gufolixatewasilirude.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/e8ad6036ecc.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/jfqL3W3/should_i_answer_spam_calls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5fe47ad93594d.pdfIn PDF document text
    • https://jogotipopawufi.weebly.com/uploads/1/3/0/7/130740597/2a69c69a82279.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/daraniwekamidir/vofureretaregoti.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/cavaliers_jersey_uniform.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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 5472 bytes
SHA-256: de4b8ce21fe5319c0b1f2b4efe8c126a2fbad34324dccca46af8ac9fef2acafb
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 10640 bytes
SHA-256: 7494fb5727d81469602d9963a6b493b2dcea07949208628d95d86422aab323c5

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