Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff4c6ff07c191c8…

MALICIOUS

PDF

78.1 KB Created: 2021-10-06 14:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 504d0ad8aa9fb421c9a22d496a297c91 SHA-1: e442b92dff1025cf7087873c2695f1666e2f4ec4 SHA-256: dff4c6ff07c191c806fd09a7bedf77739b4cb19f05271de25542c90b8c7e20d7
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing numerous links to disposable domains, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4580

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 http://cncforginghammer.com/d/files/vibutuwokibutos.pdf In PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/gibejat.pdfIn PDF document text
    • http://st03.it/userfiles/files/32834650143.pdfIn PDF document text
    • http://elma1.ru/!upload/files/54654679944.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/xumiwujafebubasi.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/46494328362.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/tisade.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/55724993686.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/rurunibunoxarijixe.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/85250483877.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/58482392050.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/fowepobo.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/rafazowetiremexoler.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/90646778571.pdfIn PDF document text
    • http://slsnn.ru/content/files/zesuk.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/9712579079.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55408999886.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/79538207173.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/vazelekakiwibaliriluvolo.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/zikizenujogabefesin.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/tamode.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/30054336588.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/fukejutetokonavo.pdfIn PDF document text
    • https://tonicsuitemusic.com/userfiles/files/26485403571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=top+poor+country+in+the+world+2021PDF link annotation
    • 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_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 18484 bytes
SHA-256: 2307cfa4bd0dc43b5d8caff4361ddb2fc9b3a73d24cd9bad5d78fd462bc7fce3

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