Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b8fac65a286c36…

MALICIOUS

PDF

68.8 KB Created: 2021-09-16 19:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e82b82c011a45c9046c9ca7ad4d71fac SHA-1: 0729570ca9365c34d7901959ca74aeb98d4d90e5 SHA-256: a5b8fac65a286c36598739995c0906fad5895ea6577bdddcb9f2599c7d20601a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The PDF's structure and embedded links suggest an attempt to manipulate search engine results or distribute further malicious content through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.fonfe.com/uploads/files/70285848424.pdf
    • https://ourlady-schools2.com/userfiles/files/kiliw.pdf
    • https://questyme.ca/userfiles/file/befeka.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/winowajubut.pdf
    • http://first-group.kr/ckupload/files/55933106476.pdf
    • https://adian.eus/files/galeria/files/75145519481.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/1114651689.pdf
    • http://aapltd.net/userfiles/file/kasofenununenexobimibi.pdf
    • http://dorapeyzaj.com/userfiles/file/zozuwisumamuzanajepatepas.pdf
    • https://webkapper.nl/ckfinder/userfiles/files/jimazozex.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f27712353---gijalifake.pdf
    • http://flirdining.com/uploads/files/75327133902.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/losen.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/teposusuvetipagu.pdf
    • https://holcom-wd.com/webroot/img/files/zakenebavaritekusunoz.pdf
    • https://gfwofficial.com/ck_imgs/files/wezafadewolamabivurumij.pdf
    • https://tarsiman.ee/files/file/69746772856.pdf
    • https://daquin-ferriere.fr/userfiles/file/kepadedaz.pdf
    • https://x-software.cz/data/file/65346937408.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/6a47cba8fbf5095c9767c773c03b0022/juwixuvumuwujogirit.pdf
    • http://educasters.co/ckfinder/userfiles/files/54847327484.pdf
    • http://gpp300.fr/userfiles/file/jigipuxokufawimidaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+your+face+emoji+on+android
    • 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_off0000b0ae.bin
c7f13730b8c3a619e4dae87b7ab538d5ff13f4fe65f9d4fe31f45a7cdcc34e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 10936 bytes
font_01_sfnt_off0000ca05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 16792 bytes
font_02_sfnt_off0000e217.bin
7a48ec76bf167f087d6d635e2ab456b7289514f713e11df96c81b37db99e6000		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 14296 bytes

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