Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa2384bea580b4a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 22:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b99d94b12a07a2524c9c1cd2c083479 SHA-1: 3cc5235d85e06488d7f020a2de4d9ffbf2e0e1dc SHA-256: cfa2384bea580b4a8d570a3dba8e19ed9b61342cf187d7f906602de1f82d8c5a
146 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware distribution attempt. It contains numerous external URIs and a link farm pointing to disposable hosting, suggesting a tactic to obscure the ultimate malicious destination. The presence of embedded JavaScript, though not fully analyzed, further supports the potential for exploitation and execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pistant.ru/uplcv?utm_term=weed+firm+2+mod+apk+everything+unlocked PDF link annotation
    • http://140.121.180.103/ckfinder/userfiles/files/zadimozisabuzisit.pdfPDF link annotation
    • http://familiegravesen.dk/userfiles/file/mededojokigukulitaxu.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jemivanumejuwumegaraxowut.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/08192257528.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/ketuxebejapanazikawepe.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402fca12470---1662146685.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/71777922967.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/85018708396.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/sogajijilelasifelupasofoj.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/48686267284.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/gaxixozebasefuratotofemug.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/debefuketojurodedixel.pdfIn PDF document text
    • http://www.polni.si/Images/files/6262430303.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/fuwepezojewaneri.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/kekasukizuzajususaviris.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/xejabapededitixemew.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/85686745027.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/65348944355.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ae9e9a8380674bcea9b77206ac411dd6/6073900447.pdfIn PDF document text
    • http://bresky.cz/res/file/bifiju.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/43290641396.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/92257007039.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_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 11384 bytes
SHA-256: f1efcf220b5d35e81accccf0dfe1212b7567fa7ca46cc9d3088f2862d4132c64
font_02_sfnt_off000106ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AD 17308 bytes
SHA-256: 0b7648f8ad1b6ed3f8f8e2949ba297037ee8564583d80909c1cc31a2b750716c