Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61df88f9eb7d1ea…

MALICIOUS

PDF

83.1 KB Created: 2021-02-22 18:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 631d4e3633dce53566cd5610e9ce7815 SHA-1: 5d6490efeaadb6f1f899d488fc8f2ac1bd3c3beb SHA-256: d61df88f9eb7d1ea4a2e8f757aacdd5c556f44f077ac4aaf428cb90fdf9f1330
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://seumenha.ru/wix?keyword=accuplacer+study+guide+book PDF link annotation
    • http://organicsss.space/238668412974lny7.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/chchjhj/among_us_unblocked_games_wtf.pdfIn PDF document text
    • http://imkl-checker.com/49815522531yb3rh.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/cfwu9G3/poshfest_2020_location.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/kjeQicd/86809262109.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/g0Dhfjh/merobepaxipubuperala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_601b7bf5185d4.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/oidjgd5/38951400246.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/hAAtiax/ion_party_speaker_walmart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_601071c5a5fc6.pdfIn PDF document text
    • http://wei-nmvc.com/15539580363q64h7.pdfIn PDF document text
    • http://baltika-trans.com/transmission_shop_near_me_open06s36.pdfIn PDF document text
    • http://copyright-securityx.com/average_speed_of_nascar_driverwmkhc.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/89560380193kgnat.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/ajcKSbK/emojination_2_norsk_level_6.pdfIn PDF document text
    • http://online-bestshop.xyz/eosinophilic_esophagitis_biopsy_guidelinesohexm.pdfIn PDF document text
    • http://constructionhouse.info/28140976032nahch.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/mjeVgcs/sugixe.pdfIn PDF document text
    • http://springtea.space/connection_game_in_tamil_with_answersbab5.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 5536 bytes
SHA-256: dbde7ebb0e0c982995a6842c3580977919915e0a492a759bcf365487b008dfc1
font_01_sfnt_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 10240 bytes
SHA-256: 14151901c494f809e223f939401315756105017bab48141161149fb100c1c1c8

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