Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f297ec5a35b8bdf…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 12:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5aa057bb1bea10682b91fc290b11196 SHA-1: a7419b0c529d2a562389b8b6d2f2219a204fd6b4 SHA-256: 4f297ec5a35b8bdff40d38a53a2c3549e1cf2a06bbe3371d2862104c29dc51a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the final destination through multiple redirects and potentially deceptive search engine optimization tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=mini+militia+game+download+for+android PDF link annotation
    • https://electrodomesticaruano.com/images/ckfinder/files/fujudelepopapadogapomapov.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/99147896853.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/7307327718.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/68303576485.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nozonurobunutizunedowilaj.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/90773230649.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/vikopi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc7d4571---9423334805.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/55268320567.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/vewebobeberurebumikare.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/50295673199.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vamenodajalizinejikuza.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/61752877017.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/belezemixe.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/pokedowukufoxajokupovo.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/rujunigeri.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/diwojon.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/ninizuwizizewuzuzas.pdfIn PDF document text
    • https://tekartltd.com/upload/files/55948299228.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///46134903360.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/36013271669.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161393a5baf7f7---42584263426.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/vegefa.pdfIn PDF document text
    • 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_off0000d2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 10608 bytes
SHA-256: f2e249552dbaeed8515f990eef2dab072d432a8654d5d2f24c6a5e754aa1b0f5
font_02_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 17328 bytes
SHA-256: fa8e4ecce749db89be19735c65d2446e763d5399f233f95f15fb68e3f959216d

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