Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec87d130783f23c7…

MALICIOUS

PDF

109.3 KB Created: 2020-11-16 23:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a1b1ca7b5661e21875f50b556bbbe086 SHA-1: bf8b3cb286d502644190d4c947bd7ea884afda9b SHA-256: ec87d130783f23c7cf0c2dad812116cd15fff46a5ebb61193c44646053713f90
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-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.
  • 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/strik?utm_term=bandai+1%252F+72+millennium+falcon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493578/normal_5faef1d27d687.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/8974704.pdfIn PDF document text
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/4936692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_5fa65fb8791f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f870d9420ef8.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/7673596.pdfIn PDF document text
    • https://mibakadediwo.weebly.com/uploads/1/3/4/5/134584598/98688fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f9fa1c7f1562.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f8cf4f44fb36.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/wanasuvedigo/words_that_start_with_about.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/madavimiduguzemamoxagabeg.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/26140037207.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/62627491343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696892b7-c059-4a89-a408-538053ce5068/8_prayer_watch_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/57292515525.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E2 2828 bytes
SHA-256: 02201fdaf2752f4422f7629c71039e5f766ffabbddac837aa70011d2fb945b01
font_01_sfnt_off00016cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CEC 5244 bytes
SHA-256: 08f4653ca9fbad3ca2c8276bda1ec511353567e2548d54ec42231f86bd534423
font_02_sfnt_off00017ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ECD 11552 bytes
SHA-256: f96ab34bb8c466f6c7be8dfcd194262be312950e4011f7a23de071088514b398

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