Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dcab2a896a9821…

MALICIOUS

PDF

72.1 KB Created: 2021-03-21 10:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e29fb39c786d0965e994fef181225e48 SHA-1: b8883bbf00ee0782f3a7c343ed1124490ded3646 SHA-256: 22dcab2a896a98214a15de3ac63a6fc8b0d4080ca158585d070d6f7e4e13f424
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=completing+the+square+matching+activity+pdf PDF link annotation
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/xulovobewowepa-garejigamomemo-lirivolajibixul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_603007fd09871.pdfIn PDF document text
    • https://cdn.sqhk.co/rujojumex/c3hcDgd/larefivewowik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_6041af0abc516.pdfIn PDF document text
    • http://praktika-ingenieur.com/531378089901cxhz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_600574d710b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_6033d00c8baef.pdfIn PDF document text
    • http://cloudmarket.website/what_are_the_four_types_of_informative_speeches_discussed_in_this_chapter0i5jg.pdfIn PDF document text
    • https://cdn.sqhk.co/dulunukosep/jcjiidY/89398979083.pdfIn PDF document text
    • https://sizezowupoje.weebly.com/uploads/1/3/4/7/134704467/1194490.pdfIn PDF document text
    • http://arthromedshop.xyz/what_does_stanza_14_mean_in_the_ravenvpfzl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404287/normal_5ff2d39d1ba5c.pdfIn PDF document text
    • http://vashmaster.info/book_of_jasher_onlinegg6si.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/suxugipipolazog/88264866121.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/brain_teaser_questions_for_adults_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/tokokamugulegepudened.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/7757021756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c384a47b-7434-4e1a-8156-efe48a980794/56815180709.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/inevitable_desastre_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5faf7e4d-f394-447f-a6d4-4ccf21364091/database_administration_fundamentals_textbook.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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 5760 bytes
SHA-256: eea0888a6f32252b2522401fc9283f9083a932b74cadd5da4789f80a8e633c80
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 10596 bytes
SHA-256: c704f3d3bc8ec43e6cd5b98e781e9b5c8ea961dad70cc42718019c46bff6a19b

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