Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d63214aac7b545…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 12:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59c9033ae18d1cbd8235a8ee6856c665 SHA-1: a2dcfac8ca7d302b2830440086c95b24ca2b867e SHA-256: f9d63214aac7b54544ef2a0a7b5163a005d17327975e2a5be41902a9f85da577
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=best+photo+editing+app+for+computer+download PDF link annotation
    • https://gobelsprofil.com/upload/files/81257510839.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/45384519895.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/65307319090.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b66a02d5ecd440f1ed5b6a07589fc44/kutoxolenenezexavi.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/rixedofuvitoka.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/14489840022.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109020337554496.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161368a731a73c---63274467204.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/wepufug.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/sirisuvonedafuw.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/22501459977.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/jurotorabovirezemiko.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/26795722864.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/29849978482.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/xotawara.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/nuwojulubesuvo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/755a34d25d3b227fceb1432e9b15079a/katozoziridemorumoxinebop.pdfIn PDF document text
    • https://e-midas.ro/files/file/majeregewakovenezeg.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/56610076088.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/29608745590.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/mesepojotamikezujakogoran.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/dopilusejaziwazilokitel.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/41198249236.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/sofajuzipubusururosele.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/15689796741.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_off0000b6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 15976 bytes
SHA-256: de2874d4a0d235d05bf262cd7f4efa1124edbe276e3bfc8bf4b0b5812cb3caa0
font_02_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 11304 bytes
SHA-256: 3cd552a8cd2d1e4740455361637e914a7d517b9cf7b842994aedc88a4dc32c32