Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d8a9b79834dcdf…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 18:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bc141342630b170054e00f1f4f65394 SHA-1: ef3f7879594bacceecf8a5c77def71cb884a2a9d SHA-256: 39d8a9b79834dcdf928a5b6e7869bfc291f06c53c562fc193e867e55c5bd9905
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs and a link farm structure on disposable hosting suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious intent, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=net+analyzer+android PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a5a632fc---54051667928.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/nekewefu.pdfIn PDF document text
    • http://tercovci.cz/files/file/jilimaremeginuzosogi.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/27987060691.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/29093090749.pdfIn PDF document text
    • https://binhvi.com/upload/files/14472606398.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/zogobapoj.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/35389411152.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/83290994951.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/32695613126.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xebanalorejeponosizat.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/pibak.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/wimezadem.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/kidewizufewix.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/gigadifisipem.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/vategixedonumatilevewumif.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/46149104967.pdfIn PDF document text
    • https://parfumzone.ro/files/file/muxolin.pdfIn PDF document text
    • https://aildf.in/userfiles/file/39533647811.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/95248726853.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/fewil.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/97503051503.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 18280 bytes
SHA-256: c19cf8aaa52de1ff3df8f8652357fe98e55d0f85c4095dfe462d2ed2e1da9715
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12199 10224 bytes
SHA-256: 8a21e5c0865607b680896230b2431aa41d30000f4cc204da687523e7322c1d5f

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