Malicious PDF — malware analysis report

Static analysis result for SHA-256 d592467e850a5960…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 04:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa3946e5d068e3bb9a67ac651dcce734 SHA-1: 3b2ed96a3c91c7a5afaef1c498a0e9fce53b6b99 SHA-256: d592467e850a5960e0aecf0b36c266b388161bd0f55986ada568c6d2233d51da
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. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with a high number of links per host and UTM parameters suggesting tracking or obfuscation. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions, and the link farm behavior strongly suggests an intent to redirect users to phishing or malware-hosting sites.

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://studiocastigli.eu/userfiles/files/josizadarojetofusexo.pdf In PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/60304141083.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/seziletudokabivuzoloz.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zibolume.pdfIn PDF document text
    • http://artospace.com/pics/file/94468497432.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/13054992343.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/42032172032.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/13041076303.pdfIn PDF document text
    • http://royalgroup.at/tmp/24714090250.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/movodorupadeku.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/vanolowojudeligapulesema.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/73126259565.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/74501887047.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/67342056725.pdfIn PDF document text
    • http://cabini.it/userfiles/files/14763463035.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/sadotulinitiluwipetev.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/bodifajumo.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/19567646655.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/patewokix.pdfIn PDF document text
    • http://generoussecurity.com/uploads/sunobunuvokaji.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/lujefir.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/diwuzumokumuguzidojeta.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/ridunaromazupir.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/72314643739.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/pogofebazovejasujesabal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=endnote+app+androidPDF 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_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 10156 bytes
SHA-256: a167b3e421957dcf5d628638064fb08ef93399d420efecdc7c89c25839312a84
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 18056 bytes
SHA-256: 5481e7632edd99a91509369bd6f8addb4ea895276720c5e7195e0e08d2525742
font_02_sfnt_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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