Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3f13c4e7fb3886…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 17:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd1fcb367ccf6315a6f526556b049960 SHA-1: 2796b09cdbd99d619df8191ea8093c9cd5c4bdf4 SHA-256: ab3f13c4e7fb38867cb14fda1cb826cb7e3a61833487e82c8d86bb45e0053597
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

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 http://sdes.in/uploads/30085155100.pdf In PDF document text
    • http://sicompk.com/survey/userfiles/files/kuzuzakij.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/bolurix.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d6f9feb87bf1440019dceb1ca396d5bb/bovumaki.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/gotitowemiwoboxovinineb.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0c0ce18b3c94d920cf7a151672fcebec/9400271885.pdfIn PDF document text
    • http://heizler.hu/files/file/50502428798.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/94127678912.pdfIn PDF document text
    • http://poliinc.com/upload/files/38756819822.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/ledusovuxojipakinuribo.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/14161756455.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xabazuzejomukeleditagafek.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/wiwelatavoka.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210915_432EF90CA67BE534.pdfIn PDF document text
    • https://izometal.net/mm/file/55986992330.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/14923280863.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090309172773499.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/89073287717.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/13208831488.pdfIn PDF document text
    • https://datenglagi.com/contents/files/kedoxutoluruvexewaderemu.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/mokirakupazeravulal.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/23096326030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=right+yaaa+wrong+watch+onlinePDF link annotation
    • 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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 18112 bytes
SHA-256: bc690978eab7ed1e769a8d38b67c4eaf306bcc0688b91e35e32743ce3cd4a83e
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 10588 bytes
SHA-256: 79bf5b65309011744e6030c681d4fad904df1398a0d712eee7ef94559df0fbe4

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