Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1392fc1a9c08e7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 01:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5241c67dc13f1fab6cd6e59e45f8b845 SHA-1: 005801ea7a857b7635f6e1c8944f72e1592c7739 SHA-256: be1392fc1a9c08e7c35e588a25c6e4290d875e9b65a1a3cb5fe7fe513162660c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a setup designed to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://essentielles-theater.de/UserFiles/File/6486059721.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/juximexixuzuvajabajek.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/31886323157.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3a5dd653---mexatun.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/85666614487.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/fiwabuvo.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/fonubinamozuvepewagowar.pdfIn PDF document text
    • https://ocw.tw/uploads/files/saxemebabuxufekunigibu.pdfIn PDF document text
    • http://retailcop.ca/files/vunawiseledefifedax.pdfIn PDF document text
    • http://3q1p.com/upload/file/210913025132898502r0sg39z3vl1l.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/fojitaledomijeloworixos.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210912074347.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/5736571524.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/monaxoz.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/10662474572.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/dedufirinatape.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8bc1d023dd973d50772fd3c960295a05/13873686854.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/rowototefedewikolurotaru.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/soviveve.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/lapebujikigifaloloxo.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/65568300368.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/280891152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=play+store+app+download+pleasePDF 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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 10492 bytes
SHA-256: 93479bc9e8324be2775d32db303a27f5b008dad09e74b37d1ce0b7d4ad53bce6
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 17520 bytes
SHA-256: 0d7c1fe19b70d548a69590fdd35ee968e11ad09473365f16c4ac940f0980bc50