Malicious PDF — malware analysis report

Static analysis result for SHA-256 888787b384db0544…

MALICIOUS

PDF

93.4 KB Created: 2021-09-17 12:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a2c3443fee80114d4421160136aa5ec SHA-1: f4d74977c8f4b44a845bd5270c936d1f951fafcb SHA-256: 888787b384db0544f5cd8636936c72e959dc7e3962f1af6ed3fd15c49eb7faac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URIs indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=wuest+bible+translation+pdf PDF link annotation
    • https://mps-india.com/userfiles/files/mipaxerubadopi.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/nudeperovudilinupabuni.pdfIn PDF document text
    • https://zzhqhi.com/d/files/povemupovorodezofemivadez.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/80901569334.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/wusipekobow.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/vusimimexarunor.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/11822864130.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/debev.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/92794158163.pdfIn PDF document text
    • http://parilka.by/var/upload/file/23423866360.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/ropinepurovesovokudunum.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413810cb11c---juguboguvezitonog.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/farorudesu.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/8184416482.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/raperazogunutimalikeza.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/39566884600.pdfIn PDF document text
    • https://signika.pl/Upload/file/62080135481.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/98956801653.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/pokitel.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/621122669.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/ganexizam.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161392b5c38a69---sogozefel.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_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 10724 bytes
SHA-256: 03b3ed54a663fc379d3ff14ad99e51d089ae6de89ccc436efb2b4f855db97f2b
font_02_sfnt_off00013a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A03 17752 bytes
SHA-256: 53978e0b8135ed6c9381e4091a56c096a93cbf382616e3360630305ec60c09f3

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