Malicious PDF — malware analysis report

Static analysis result for SHA-256 8364c8479c4cde32…

MALICIOUS

PDF

74.2 KB Created: 2021-02-12 18:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3fdafd674f6a39408b26a50ad501c029 SHA-1: 7acfd56b3a121afe9ff6d650c8e03a1cf7946426 SHA-256: 8364c8479c4cde3260903e492e20843490dbea9efe98acd12ad3837b2465880d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware disguised as movie files. No scripts were extracted, but the extensive use of external URLs points to a downloader or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/123?utm_term=home+alone+3+google+drive+mp4 PDF link annotation
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/a3b4614e8dbc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_6014cb0d74735.pdfIn PDF document text
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/kofulugininil-fijodimes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485926/normal_5feb3ac0905cc.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/aGSViey/20990539205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5ffbc7b81f371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_5fcfacb0e8994.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/beeb324.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/gQrjh6m/15687759626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_5fe2351bb85a5.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/iBjeQih/paper_and_pencil_games_for_one_person.pdfIn PDF document text
    • https://rowexajezer.weebly.com/uploads/1/3/0/7/130776500/69f8cce1c.pdfIn PDF document text
    • https://noxiwufozale.weebly.com/uploads/1/3/0/8/130814513/643862148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_600a45a0e5eb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baverasoge.epizy.com/battlefield_1_code.pdfIn PDF document text
    • http://tutedenomazul.epizy.com/filomezobeb.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 5376 bytes
SHA-256: 8973d5b25fa25f8b6fd22fa8d339d642082377b432d7e88d4bc53fd536720cca
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10368 bytes
SHA-256: df25cbd2a1267efdfc16f6374e01be6f50bf29dcac1e59654582c42a763f4fcb

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