Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c72a568296142b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 10:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2b771ec2397c29465a1d3b89e9319b43 SHA-1: b15842587b70d1a9d8b0c60115ca4360a7a2d717 SHA-256: 42c72a568296142bd88155db6db139e4d97da370762fe416b5976343adf5a0ca
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a lure to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of embedded JavaScript, though not fully detailed, suggests an attempt to execute malicious code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/123?utm_term=compliance+sheet+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443598/normal_5fd8e2859314d.pdfIn PDF document text
    • http://wativeb.mypressonline.com/jokazuleliv.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/3846449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_6028750929f0f.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/zrzgdhc/ruzataw.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/5552ecd1f738.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/L5iexG7/ghosts_in_the_toy_box_chapter_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5ff95ed7df5f3.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/jdjbiga/like_father_like_son_quotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_603794c195604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fcc3738a05e0.pdfIn PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/zetoboboga.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/hj7iQgd/95280355527.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/gjbhfOy/paypal_phone_number_402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_f2b3054e9b3943e2b2578a9f81b74683.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf971bc9-3ea4-457b-b8a5-8f5e46c758e2/milomujipisudoxugusak.pdfIn PDF document text
    • http://jeximojela.myartsonline.com/answering_islam_geisler.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_deef52a1560141c1b5fc7a74d74d4cdb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9aed8c-b12e-421c-8a25-dfaefaead0af/87038627578.pdfIn PDF document text
    • http://kubowulurarekij.myartsonline.com/tramadol_acetaminophen_davis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fadb60b0-e2f3-4b47-8e3b-25c8a7e2bf28/descargar_libro_de_urantia_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e9cedd-e160-4549-86e8-b6098c5356b0/serokalupulinor.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_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 4984 bytes
SHA-256: ef6af1285374e1dae73d0dc6f7e7c542edabb3b5f2c09dbc3622c48a2606f594
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 11576 bytes
SHA-256: e05d8b6623fceb8a32395dadde156d0e3bd89ee667805167576606b7bd4d0c32

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