Malicious PDF — malware analysis report

Static analysis result for SHA-256 5441f142e0cfcd34…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 14:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c61ea56b7cf049e4b4672940d3f73d6 SHA-1: 12078df30a63f9ab4c636ec76f999aae3a8fe38c SHA-256: 5441f142e0cfcd347b0579beeea5d3401a2ab4861c99942dda2e69e26fe16133
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external URLs. The presence of many distinct, potentially disposable hosts suggests an attempt to obscure the ultimate destination or evade detection. The primary attack pattern involves directing users to external sites, likely for phishing or malware delivery.

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 https://philly.drinkpoint.com/uploads/files/jutojuj.pdf
    • https://futurefacesmiami.com/uploads/file/masijufileruk.pdf
    • http://dges.in/userfiles/file/61570391652.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/86003301176.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/12819490732.pdf
    • https://doan295doson.vn/namthuan/images/news/files/jujojudovivamotij.pdf
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/97228596311.pdf
    • https://pasifikendustriyel.com/userfiles/file/mimojeli.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/vitetigimitebefitow.pdf
    • http://lsphc.com/userfiles/file///49120295991.pdf
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/89975720496.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/5613935317.pdf
    • http://www.petersonassoc.com/emailimages/file/39437154212.pdf
    • https://glaskunstcentrum.nl/images/file/fogezigijatiri.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e43b4a75c8def935d1cdd781a472ee04/38612365594.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/24297116430.pdf
    • https://siriusdynamics.com/assets/uploads/files/66458139050.pdf
    • http://gocep.org/data/userfiles/files/tinav.pdf
    • https://nbretail.com.vn/ckfinder/userfiles/files/tagabijogasagivorujug.pdf
    • https://upaspor.com/resimler/files/muxikezedes.pdf
    • https://dorfadvertising.com/ckfinder/userfiles/files/54491783686.pdf
    • http://gancza.pl/userfiles/file/96135775205.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/ralabelegasin.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136202d97560---wisuzerufawanapel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nova+pauta+aduaneiras+angola+2018+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd2.bin
c19f8f812ccb05a44989a8581a099861397df775fb5eb9fcd2cf1ad970151b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 11320 bytes
font_01_sfnt_off0000f87d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 16792 bytes
font_02_sfnt_off0001108f.bin
17c11ddf95e3046ad9ee1ce01d2008bab50464fbb09286e9e918398ebadecda6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 18576 bytes

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