Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07aa72ef306f183…

MALICIOUS

PDF

85.6 KB Created: 2021-02-23 04:01:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 07007d2ef13dde18de018e95f27c1868 SHA-1: e7ca89c00e1dccc675541fb7b331a50270faddf1 SHA-256: b07aa72ef306f183e347e9fc9271b7c55283947cfa82e247445b38a4bd1fff75
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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/strik?utm_term=lisa+lowe+immigrant+acts PDF link annotation
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/fuxunotep.pdfIn PDF document text
    • https://pubagugok.weebly.com/uploads/1/3/1/3/131398253/05b3c6c6003.pdfIn PDF document text
    • https://fudewuwadume.weebly.com/uploads/1/3/0/7/130740250/8eb7c498c941b62.pdfIn PDF document text
    • https://cdn.sqhk.co/raxedaninaso/hbhvh2d/world_of_warcraft_tower_defense_online.pdfIn PDF document text
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/1726876.pdfIn PDF document text
    • https://rewapukin.weebly.com/uploads/1/3/5/9/135961798/6851415.pdfIn PDF document text
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/1274971.pdfIn PDF document text
    • http://rijuwutosepirol.iblogger.org/cpr_guidelines_2015_erc.pdfIn PDF document text
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/betapedugi_xosenu_repadu_newox.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/leteraxewe/vobepasaxipevadajin.pdfIn PDF document text
    • http://rufofexejojar.epizy.com/logo_quiz_level_81_answer.pdfIn PDF document text
    • http://vumojixo.epizy.com/betwinner_apk_ios.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
    • 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_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 5152 bytes
SHA-256: b8a0e7a6d5595ee6992c168cc88f81b0cd7af13e560f62b1dbc62e1676d88c85
font_01_sfnt_off00010d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D37 11976 bytes
SHA-256: c4bd481f9d7b7818071b48ed1ddd85a6a96f0dbfac9e50c233c8c8e4b565bfdd
font_02_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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