Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c210a766723d3b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 03:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 645a807ed4ef84805dcaa9675672673a SHA-1: 604c4165a8ada28e19126f9a1abc635ba7076b6a SHA-256: f3c210a766723d3bbd7bb78aa27a629333da709f892684d66acf09ed2c2c5749
174 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=mod+apk+hacking PDF link annotation
    • https://hopadive.cz/ckfinder/userfiles/files/kunotabifumakopon.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/zatagilekinuren.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/botaxir.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/85393041446.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/guremiwepusukunid.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/tuxusavalitekam.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f996e43f2f---49683148704.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/xipiwuzokapiripaleviwuda.pdfIn PDF document text
    • http://jn-zhsc.com/upload/xugugusodataje.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/tixeke.pdfIn PDF document text
    • http://fitviewer.biz/files/file/31911415013.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/bilesonixetezidanekinu.pdfPDF link annotation
    • http://www.jacenter.org/js/ckfinder/userfiles/files/98943203752.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/12285378078.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/77122736237.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/71204149984.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/93513726598.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/57186605151.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/tegejozifuwowuvubaz.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/80401735315.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/bemakebalamafojunujog.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/89298007646.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb7f40fae---27496068212.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fogilozijilesa.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_off0000d7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 17040 bytes
SHA-256: 947e22248d021a886661a461ec57fbaa9055a2ac88b84ddaaf78e5d425933145
font_02_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 10332 bytes
SHA-256: 56a80c6ccd2e2d8f162f3d0ba270c88d9b63118751fbf6dae7b65d742dda31a7

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