Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fec40e2a3f5c42…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 11:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ebb94e333ddba20cddddb21584da69e SHA-1: f0da22e519ac0c2e4410ec0ece7b50b1a623d7a7 SHA-256: a6fec40e2a3f5c42b291917d77b9dfbdc522c0cec770225c01ffa8b022e52745
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or redirection scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates an attempt to obscure the true destination or distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99638089673.pdf In PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_D7C05279910D3EF4.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86414086293.pdfIn PDF document text
    • http://citty.org/images/uploads/file/40173229786.pdfIn PDF document text
    • http://01host.ru/userfiles/files/kiwogexeli.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210905002736.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fadabinasepifo.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/jirurakebamufasegejuf.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd145df34---95575866477.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/13558011130.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/5162322537.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/kulagusegefibo.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/92972469305.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/28028962050.pdfIn PDF document text
    • http://dsagco.com/Upload/file/32270006964.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/60224820908.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/bujil.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/wexifowuk.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/65b1918bd6753376aa6892ff06a452e5/94362748445.pdfIn PDF document text
    • http://taociren.com/upload/file/2109091318433081392m0gdrw93jvs.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/98422585834.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/xofejidujosa.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/pevosewiro.pdfIn PDF document text
    • http://foodchemsino.com/d/files/gisukenekuminizumureg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+tv+series+online+free+putlockerPDF 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_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 18176 bytes
SHA-256: 4d1f5a472c0ebe0d6fa2d214d30681ccd899bc45cf6ba5918eb713b301138055
font_01_sfnt_off00011951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 10828 bytes
SHA-256: d8a058217b9000c0302b2c7f147b9519b5b57beeb373ee0b06effaa8a7cfe531