Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf9305b178b0936…

MALICIOUS

PDF

76.3 KB Created: 2021-10-08 03:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 53f8364c0c1bef4c0d3668f24fe2c41e SHA-1: f20ae28c4c62896c216d617e7c4091fe50ebf9a0 SHA-256: 3cf9305b178b0936599ca7ff1e3589a8f51fc820fa4b54c0cddb5f8d2d582799
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to disposable domains or IP addresses, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • 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://archism.ru/uplcv?utm_term=4+pics+1+word+level+431+answer PDF link annotation
    • http://pk.mo/userfiles/file/sofazejedepolazajo.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/gojajajeligikutasaja.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/vubuxemukijunavuzadajek.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614105d982031---tigipede.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/8418808986.pdfPDF link annotation
    • https://glozorcom.merlak.ru/userfiles/file/92344998649.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/pomesejawesunab.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/wezejurixuvulibidinuxeso.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/41184279835.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/25010481435.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/54455636512.pdfIn PDF document text
    • https://servicenter.ro/ckfinder/userfiles/files/nawumaxikavusuto.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/35911055832.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/18717537888.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/28050314427.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/031014135656.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/xaruvexifalutomuzudepel.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/39839126383.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/85874363140.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/91768291806.pdfIn PDF document text
    • http://aztkgb.love-mrt.com/upload/files/72660709909.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/86624566409.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/xizadapozexeri.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_off0000c2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A8 18888 bytes
SHA-256: 369f7e18103f44f8abba96c0a59b1bc036fbfe93871b48d949dfdb998b5be8aa
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 10768 bytes
SHA-256: bb5e09b725f05e60e120f644b04ac5f6c0503311549667d7d1a94190e2ced8dc
font_02_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1