Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3774c478eb7249…

MALICIOUS

PDF

83.3 KB Created: 2021-02-20 10:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 94c22c8a2d4d039158077dc068611246 SHA-1: 3de680a24f53b034f79250c2c061bd4fc7f54ade SHA-256: fe3774c478eb7249843d41da931849eafbd5b5e9dfb49233ea2c92600ca95c4e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, and contains a large number of external links. The 'PDF_SEO_LINK_FARM' heuristic indicates the document is designed to host numerous links to other PDFs, likely as a method to distribute malicious content or conduct phishing. The presence of embedded URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=25+nautical+knots+to+mph PDF link annotation
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/6082934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483336/normal_5fff09f0b1ffb.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/7iiDUhd/35112796078.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/4gjAJhj/38976764378.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/2gdjbge/jebewutudiwet.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/katazejiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/3pHcgcz/d-_day_movie_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/7gghbih/pegofobolekis.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/I7AHhiO/es_parallel_accounts_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/SDjePvJ/40404803977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475565/normal_5fefa478b6382.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/sogewogob.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/jiRuifj/degamodaroxodusupa.pdfIn PDF document text
    • http://gufutaca6.xyz/dell_laptop_black_friday_deals_best_buy7sl70.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/ibjbJ6S/76525483363.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/U6JEwge/wazevojetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 5300 bytes
SHA-256: b1c65ef5a872ee1a872eec19e26e190901aa87bec10cd1bae356b71a744bd602
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 11464 bytes
SHA-256: 58400768daf71a8a3adc50c06a283a8b4a950294ef18d688de6ce35652d3341c
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 16168 bytes
SHA-256: 13596defb2bcc6fc1048af8e1a4b019015f57a35384aba88f9e1637b8f94b635

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