Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd212a74589f6d4c…

MALICIOUS

PDF

69.7 KB Created: 2021-02-14 01:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 98dc1cb0929a988193c8bdccc9d72c57 SHA-1: 935114bae0f29de0c5540c68301b480390671da7 SHA-256: cd212a74589f6d4c988128b35e83110835077432312afbccb22610f01ccb6c67
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The document body, though partially corrupted, suggests a lure related to a 'character reference request template'. The presence of ClamAV and ML heuristic firings strongly indicates malicious intent, likely phishing or malware distribution via the embedded URLs.

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://leonvi.ru/wb?keyword=character%20reference%20request%20template PDF link annotation
    • https://cdn.sqhk.co/sabimejuka/cqhj4tt/47119431236.pdfIn PDF document text
    • http://vereffka.xyz/bizevexopobizebuzidafnuhf.pdfIn PDF document text
    • https://bisofojud.weebly.com/uploads/1/3/1/6/131607445/6785793.pdfIn PDF document text
    • http://repair-planshetov.ru/monthly_spending_tracker_spreadsheet62smr.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/44729654289wn4g5.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/gchjjir/56495022162.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/e5ogjga/buffalo_gold_super_free_games.pdfIn PDF document text
    • http://malalij.iblogger.org/47095661291.pdfIn PDF document text
    • http://triple-doska3.club/63026422935eyz7l.pdfIn PDF document text
    • http://winoorama.site/fomulakavorepamokopem24o16.pdfIn PDF document text
    • http://ek-arenda.ru/58115242368y68i6.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/ekhcjej/3033542679.pdfIn PDF document text
    • http://menetufebev.22web.org/create_new_document_from_template_word_2016.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/lezelivabeje_gonapalo_jogedejoxaxuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gerosopidazab.rf.gd/nosejewavozanukoxonova.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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 5284 bytes
SHA-256: 8dd780327b270e0ac82d4f3815b89af3968b64ec5f9e496d3704e6e7d6db011a
font_01_sfnt_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 10732 bytes
SHA-256: 7454f7b07bb552227229f13186e7f54bccb94ff51c800e5de02899c26cc203da

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