Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7e9e8a4094ff5a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 07:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5ea9c891c7bcfb59ecc9de260138407 SHA-1: f708eb5104e3e16b6536d067feaafac37f37ec88 SHA-256: 9a7e9e8a4094ff5a7b78f65c26d0bd27d8c2c71be5f61c2be712d053b78ee12d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, suggesting a lure to download further malicious content. While no scripts were directly extracted, the nature of the PDF and its embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gesundheit-im-blog.de/userfiles/file/3862795675.pdf In PDF document text
    • https://tramtron.vn/uploads/files/files/sopewifajenabu.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/47565353701.pdfIn PDF document text
    • http://landpas.pl/upload/file/wotafimofivibisu.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/56668075137.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/65127527900.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/36224284474.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/72854167015.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/vitilekol.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/lozajibaw.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/36098509088.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/kuvirikaxum.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/48954233183.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/79454455098.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/nanoneripixoroduno.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/xoselesiminilanefakugepa.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/rebaxiz.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/wutulixobejifokesi.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/32077245933.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wedibizipan.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/63533553863.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/16333152799.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/1851857787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ninja+saga+hackPDF 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_off0000c61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61C 17060 bytes
SHA-256: fea8dae1d62313a4fd3476343a1cf58b10c1478fee0b7313d44353c58f7c0378
font_01_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 10212 bytes
SHA-256: ffb1665d3301bb10c186620f87783114559b2706801e5e92c0b764a0fa8a29af
font_02_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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