Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a22f3d2964dfda…

MALICIOUS

PDF

71.6 KB Created: 2020-11-23 15:25:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d70e22c98eb6c08d42f7c186a6ac37c SHA-1: 58321ab146400db8dd46aa90b22a26aace3bece4 SHA-256: f8a22f3d2964dfda3c90d0a766e96129f31f5d2c48adfa514f827d0c1b760262
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with the primary URL pointing to a suspicious domain. The 'PDF_SEO_LINK_FARM' heuristic indicates a large collection of linked PDFs, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=best+zelda+classic+quests
    • https://pamopalosi.weebly.com/uploads/1/3/4/8/134857187/mizixevotasexen.pdf
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/tijafikumad-jusafugejez-jariw-zipejivezemub.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/zeroji.pdf
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/3282475.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fd62e82c-e6e5-47ec-95c0-09b9efab4a29/runaselurutukupore.pdf
    • https://uploads.strikinglycdn.com/files/20fed75c-d124-40cb-adb8-57cf9c035e32/celtic_alleluia_sheet_music.pdf
    • https://s3.amazonaws.com/gogonof/game_screen_recorder_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/4355fbd7-8969-459b-9b61-a6ff110c97b7/27581172593.pdf
    • https://uploads.strikinglycdn.com/files/2cba638e-c57f-4aad-9df0-a2e3bd8bc742/86602938642.pdf
    • https://uploads.strikinglycdn.com/files/76b14f2d-50fd-4d6b-86a3-379e5f777d7d/tokyo_ghoul_cap_1_temporada_2.pdf
    • https://uploads.strikinglycdn.com/files/1d1122f3-e3d4-4d08-a189-d10b174bf9fd/teoria_general_del_proceso_jose_ovalle_favela_descargar.pdf
    • https://s3.amazonaws.com/vuraradaso/todazafubetena.pdf
    • https://uploads.strikinglycdn.com/files/48b09db5-0b10-4c2f-9d10-1d78ed8cb532/47707813236.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc80.bin
ac7403254f0b3770bc26157f618a478325771409ab9c0d914584e884c61df7d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 5060 bytes
font_01_sfnt_off0000edd1.bin
3fb3c0577550ddc53bf9f56739e211b5229b29ea024ec7852ae3119954f72f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 10648 bytes

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