Malicious PDF — malware analysis report

Static analysis result for SHA-256 af31aee9f3241598…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 13:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 840ab4f68bafd95b8c4240d83d3e705d SHA-1: 1d59a95282f0215095ea58c8510252d660078496 SHA-256: af31aee9f3241598645dde62f87690213d33ea6f64f0b52e4da0fcf4bb92239f
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a high-confidence heuristic flagging a link to an algorithmically-generated URL. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tavio.ru/files/file/kukufowab.pdf In PDF document text
    • http://jubangh.com/Upload/FckUpload/20210913file///xesukilosuxovaga.pdfIn PDF document text
    • https://sealskinz.ru/files/file/4623522977.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/67959768812.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1953e8a3e---duporijidanogikamu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e2cd2236---likosonale.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/38369768893.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/suwewuxeroserurilati.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/75471704711.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/xulinizesegiraror.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/komonusef.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/32152288642.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/88043510491.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/65734709310.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/xuranaximebaboxavubimafug.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/redugukigapuwerujapez.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/88357270723.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/83587133265.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/27079702860.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/satexadejajexuresukowig.pdfIn PDF document text
    • http://dentherapia.hu/files/file/74394558874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bg+remover+photo+editorPDF 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_off0000d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 18584 bytes
SHA-256: 15711dc7cec42252ccd96c011b3c509d57d8eb9500ed202dc845d401c98969ff
font_02_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 10480 bytes
SHA-256: a3cd267b34065750f1ea957f17c476993d47dc878623b8b52a8fc0683ca8ce9c

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