Malicious PDF — malware analysis report

Static analysis result for SHA-256 157e967ff1ac609f…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 23:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 239a2e40906a3c5797e73377379042b8 SHA-1: 368b1d21070efa1fc9e3c70c5e2285eba48259d5 SHA-256: 157e967ff1ac609f892aae1cdb207e486ac24697c339c3ce8804f3a68310cc4e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

Heuristics 4

  • 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
  • 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=samsung+galaxy+tab+forgotten+password PDF link annotation
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/13823816329.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/97523050455.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/virufajagoz.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/16426592328.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/38176990263.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8cc15062fb204b5dad5a7c1101b3ab95/75563834622.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/13401648437.pdfIn PDF document text
    • http://mobil-tech.com/files/91823634113.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441e0c3ebca---18540200523.pdfIn PDF document text
    • https://nistd.in/userfiles/file/22258411480.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/bufonurusiwizerev.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/sosepimogisikurezetep.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/43446892500.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/97674998838.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/wasugonej.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/43627206266.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631242288jatufepapufivirusebex.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/kemobiriwidetokulanunu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/97197151699.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/91217225902.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/31265894208.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/53859945816.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 18984 bytes
SHA-256: b20c66364345f98874d2f36a16d4837192c96fdde6e59df190066584ef00adff
font_01_sfnt_off000107e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E9 11364 bytes
SHA-256: a56437d9491fd9a11d03134ac7ec3a115e100fe4de6df9d168db30b188cb57a0

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