Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fb6a098e92e454…

MALICIOUS

PDF

72.9 KB Created: 2021-09-22 14:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3c3580d21a200678e199eed68e0fd6d SHA-1: f18d4df954e6c540e9755a01b8260e0c4cdd71cd SHA-256: 66fb6a098e92e454017fef425f81914003b879734fac7203eeb9c62a0bfa6e11
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=resident+evil+nds+rom PDF link annotation
    • http://woykoff.hu/upload/file/gewuzipesabifo.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/74643476864.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/47649630898.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/zajebedokesi.pdfIn PDF document text
    • https://derfo.info/resimler/files/vibotopunu.pdfIn PDF document text
    • http://stonebreaker.at/gewar.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/tipawitoroteroxinozi.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/dowatifowafedesibe.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/fuzojanipilibutepemaje.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/30055592010.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/lasiwuxurenozat.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/zumug.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/nenuporixaz.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/bexazerexajagitudinefek.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/lokijotijuwowidutafe.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/52481746981.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/44014682934.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/28905404710.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/bizegojojalokimemuj.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147de6fc7023---wisusikodute.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/volodusiwufunixi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613133b715147---tudokenutaweza.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_off0000bb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2E 16872 bytes
SHA-256: 5aa6e671598b51afe2f6cadee2a84f397ffa156c6be266ed3bfa1a995e30d547
font_01_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 10360 bytes
SHA-256: b5651180313c3352ad3ad555ba0727dce9e9882f4143149862e733a48e6813dd

Open this report in the interactive analyzer, or submit your own file for analysis.