Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbe3e656739a42c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-11 20:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c0d7cb7eff645285eb9cacb8f294045b SHA-1: cdff8ae09818345a6f5a1e2c8af171b67629fcdc SHA-256: 4fbe3e656739a42cf7af80eddb30a0d331861ae6c2b02c26359e1b97ce833db9
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards a common tactic of directing users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2832

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=eve+online+angel+damage+type PDF link annotation
    • http://studiomanzetti.it/userfiles/files/pufumixifixej.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/75793671290.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/dejoxipuzexo.pdfIn PDF document text
    • http://simoncaulkin.com/images/foxuzaxutipinuwube.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/21405549936.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/senodugixesabowibavuxu.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/93335058266.pdfIn PDF document text
    • http://ladna.pl/user_images/file/raxusu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613399ba0b54c---rosunajilaxalorozinoru.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/patokuwuvofajuzaruwalil.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/figavizurejuzag.pdfIn PDF document text
    • http://cityfate.com/files/files/boragawe.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021911836374379.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109041729293107.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210901225436.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/4313980309.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/felujezawuvo.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/70388424663.pdfIn PDF document text
    • https://emenu.hu/editor_up/36216772230.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/41433258087.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/vewowelofalomuj.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/sunalofuve.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/62906651215.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/34432822154.pdfIn 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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 10632 bytes
SHA-256: 5df5b9520bfbd0a0d61d06a6aa62f8e100bd767fde7e4cd44cbe542ec4e0506d
font_02_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 18004 bytes
SHA-256: ed8baa65535b8aed279d1fca869ea695701d30158212c0629ce737b181aa00aa

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