Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f81a20f0b9b16a1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 19:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d04c68fe3934f03358cc851d66b0cefb SHA-1: 8a861aada81e2af7b3aef5493a60a8b968426242 SHA-256: 7f81a20f0b9b16a14f9fec600087861bb7bd22e4c228a55f0f2cefc6c11bae11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=all+in+one+toolbox+premium+apk PDF link annotation
    • http://konemara.hu/userfiles/file/45955449463.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109092205214131.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nesug.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/fibuzagawinepofenosaganiv.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77339955389.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/54007770796.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/16899107217.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/pofefejemutalar.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pokok.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/leniwavukebikumor.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/20017437110.pdfIn PDF document text
    • http://lblussana.it/images/file/mazawipolo.pdfIn PDF document text
    • http://retrofotr.cz/files/file/28497651704.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/sedupurusu.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/21933749873.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4ot0br9r01ck32v5uk6vue22s6/20676188813.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/67857154464.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/kebom.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/89993744815.pdfIn PDF document text
    • http://salt17.com/userfiles/files/59325096311.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210904113331.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/duvejedalejenede.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/sulideput.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/12604042355.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_off0000b2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CC 15076 bytes
SHA-256: 858b9393e6093cd4a00f35eda4d9217c8d0beef758c00024f8bc2fdcb7ac9a86
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 10660 bytes
SHA-256: 9fb92dc0b633158713e2286e1fb1a79984898ff510ce658866cee96ce7684d51
font_02_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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