Malicious PDF — malware analysis report

Static analysis result for SHA-256 765b187db6d1bc12…

MALICIOUS

PDF

85.5 KB Created: 2021-04-26 19:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 37e93f42ec2369383049a5fa9ae4e4ab SHA-1: 9998440864064b269d5dd908e0fe521e63f0bfe3 SHA-256: 765b187db6d1bc126178eb922f504777672c790ff6ef6f0d874f520a805129b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to other PDFs, which is indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=boss+gt+1000+core PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490367/normal_6019b4e471550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448746/normal_5fcae7a91f687.pdfIn PDF document text
    • https://pudeputuxokaj.weebly.com/uploads/1/3/5/9/135968230/4133562.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/business_english_phrasal_verbs_lesson_planpxvw9.pdfIn PDF document text
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/sorosojanu.pdfIn PDF document text
    • http://klosheff.xyz/gabijusawanafilasujekrnlot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5ffdd6cba0ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470833/normal_606e67fb15a9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404308/normal_5ffe196f3b809.pdfIn PDF document text
    • http://simcars.ru/23130137037ruunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_603bc806a1d08.pdfIn PDF document text
    • http://instacopyrightcenter.com/5207081945545tgc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_5ffff04f500e8.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/jenisozazewubo/laryngeal_cancer_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/tax_itemization_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/how_to_explain_radical_acceptance.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/rowdy_baby_video_song_mp4_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/43634933837.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/xivirokoka.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/63339918653.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/keurig_b140_commercial_brewing_system.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/sony_dslr_a350_video_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/59257520651.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_off0001063c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063C 4968 bytes
SHA-256: 036c970eee3d929fc5f82a83f00a8596d013f34d47bfaad2d38da15b28b7d300
font_01_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 2044 bytes
SHA-256: 91a2483cff7d46cd2695afdcb5499f75165020984844fb5d5e4ea1aacbfa0e66
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 11612 bytes
SHA-256: e99ccfa07dc05156a8de636f65187a90df2c2697b8d4e72e30d9793c1f36542d

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