Malicious PDF — malware analysis report

Static analysis result for SHA-256 c709291cff63a0a8…

MALICIOUS

PDF

73.6 KB Created: 2021-10-01 16:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37040f6e00ab43da5e6ffe4868f37fba SHA-1: f011ea7ef2c49df4e49bf4fe17e908380af92966 SHA-256: c709291cff63a0a8e42cb70fee192a266f2df699574907b863bd8be3c3d39295
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the nature of these links. No scripts were extracted, but the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=keyboard+disappeared+android PDF link annotation
    • https://tanthueviet.vn/img_data/files/35167651647.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/sulemezupenefami.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161497d522dbb8---10917314063.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/mobewuri.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/milodexo.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021924049495479.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/sobefejapadunagexebate.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/kipubevasefujaju.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/dofegapajopadukexepetopez.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905f4410e0---43852959210.pdfIn PDF document text
    • http://progetec.org/userfiles/files/34170277167.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/mixakozumuweguwotub.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/36684887691.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/poveparezibakemetokugagi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/zawidanarexemanuzut.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1632388090.pdfIn PDF document text
    • https://kokomanis.com/contents/files/96765904185.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/makufixigurowa.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/semuwitajum.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/lomowefena.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/17750283810.pdfIn PDF document text
    • http://pactolous.hu/upload/file/gasugukidogof.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/40214953798.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_off0000b95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95B 18348 bytes
SHA-256: 625f7016fa2462df491e779a93efea346a38381887a30dd4a51bc29a66e011bb
font_01_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 10488 bytes
SHA-256: 88fb50c3bdf0a5e3ef0a6b1d9e564b979fd3cca3f11316787438e692960df777
font_02_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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