Malicious PDF — malware analysis report

Static analysis result for SHA-256 1851db94087f4b7a…

MALICIOUS

PDF

70.9 KB Created: 2021-02-24 05:38:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 369a6297036aca5106eeca3fea3d0751 SHA-1: 824ee08645221865ca52373513f6badde8ab7b4e SHA-256: 1851db94087f4b7aa74d0bddc53234bc1b7efbdafa4e165ec1590eeb07d913af
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains embedded URLs that point to link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this by identifying the document as a link farm on disposable hosting, likely to obscure the true destination.

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 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://baarspo.ru/wb?keyword=dyson%20small%20ball%20animal%20upright%20vacuum%20manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377113/normal_5fe4fbd778015.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/nesisoguxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_6019b16c756a6.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/jejeaK8/images_of_zee_tv_actress.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_602ea9b9e9ede.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/hjeh8gg/93873712442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_603136d5b189b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5ffbffc3300e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453337/normal_5fe4438cd6850.pdfIn PDF document text
    • http://rojemokigir.iblogger.org/mofiludalubadijete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofarogupa.rf.gd/gopro_hero_3_specs_comparison.pdfIn PDF document text
    • http://nipuxedexup.epizy.com/deep_freeze_mac_user_guide.pdfIn PDF document text
    • http://tivogowajap.epizy.com/telepenevovimudupi.pdfIn PDF document text
    • http://tanozetodane.rf.gd/boeing_corporate_social_responsibility_report_2018.pdfIn PDF document text
    • http://vogafaxusa.epizy.com/chrysler_grand_voyager_2004_owners_manual.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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 5648 bytes
SHA-256: 958d8c9c0c280511d05941df5c5575feba5302c7072eb5fac966896ee03e053f
font_01_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 11032 bytes
SHA-256: a7f473a469ee74f37a0f0bae65619095c14f053ba254de7c5fd63ab91e5ea014

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