Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f73f7726496033…

MALICIOUS

PDF

62.3 KB Created: 2021-10-02 12:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d50d282bf428633e81ddbc2434f154ae SHA-1: 322b2613f31628b2da673ee04e6ddbc59d803f7b SHA-256: 98f73f7726496033e2bd0a3722ccb68fbda17b2e3fc885594f44071769e4994e
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to suspicious domains or IP addresses, and is flagged as a link farm on disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample, but the overall structure and URL distribution indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://infrive.ru/uplcv?utm_term=gk+objective+questions+and+answers PDF link annotation
    • http://sm.ac.th/ckfinder/userfiles/files/punibubawusuf.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/69389777011.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161308d48e63e1---86816078620.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/fixoruguxazikuzefisejusa.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/22087686820.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210930191233.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/43806474414.pdfIn PDF document text
    • http://usateatop.com/_upload/files/fuberanupuwixilus.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/71453341923.pdfPDF link annotation
    • https://journeywithmypet.com/ckfinder/userfiles/files/7514452428.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/bonexikulukatazurunixom.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/deligaruzodibodamikibilur.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/35360709084.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/wubozejubesabifokuk.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/32619509012.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/jozanolesagudatosupu.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/dojolesibanejodes.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419c1cd4669---55046381670.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/91085481675.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/90399042916.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gomevulavawepopetod.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/febomurabanakujavodo.pdfIn PDF document text
    • http://voijin.com/userfiles/files/veloka.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 11116 bytes
SHA-256: 0c3bf654a36cca1a1b1fa6123e6cd59a07b0139eebe83086cee86e707d2573a2

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