Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c24ebd96d66f200…

MALICIOUS

PDF

74.9 KB Created: 2021-03-29 05:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 615fcd95c7e95bd5aaab0eff00329f00 SHA-1: dc68adcfd5deb16045802a0b9787e7353ca7d628 SHA-256: 9c24ebd96d66f20050c110a0ae30c3232eb90fbb79cf5f5ff0a6502e669cb25c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The document body, though heavily obfuscated, indicates the file was generated by wkhtmltopdf and contains keywords related to 'anatomy of teeth pdf', likely a lure to attract users to malicious or spam content hosted on external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=anatomy+of+teeth+pdf
    • http://reduslim-shop.website/army_wallpaper_hd_download_shayarith0kz.pdf
    • http://dhl-order.info/how_do_you_fix_a_black_screen_on_a_hitachi_tvm9l5s.pdf
    • http://0fruit.space/playboy_price_guide4v7as.pdf
    • http://ig-copyrightnoticehelp.com/13541430003bhv0s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bd5e8a39-7345-4d1c-b933-e8ec171ec4b0.filesusr.com/ugd/2dab9e_bf7169c7fe1b41ad839686ce99e02265.pdf?index=true
    • https://s3.amazonaws.com/leteraxewe/20469148912.pdf
    • https://s3.amazonaws.com/zidenigad/ritiritaxoxibonamobo.pdf
    • https://s3.amazonaws.com/dutimajizowa/zefudepudirumezoreruj.pdf
    • http://vefofiben.rf.gd/the_r_in_the_acronym_smart_stands_for.pdf
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_52165782a6cb4b31b676157fa4fd2934.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_a0d293b2777845fe9fe7e075f325c715.pdf?index=true
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_30e4827ea2244f7085b96f63b892c5b8.pdf?index=true
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_06dc6883338f460e8800b2ddd7e6fa02.pdf?index=true
    • https://s3.amazonaws.com/jolunenafobuw/pomufixumetanariduvizima.pdf
    • https://s3.amazonaws.com/zedudo/32159797641.pdf
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_14a53645712a442eaee51ef56f807e22.pdf?index=true
    • https://s3.amazonaws.com/tupofelasujewas/hp_layer_3_switch_configuration_guide.pdf
    • http://fulapokop.epizy.com/fisirefomobusatoganem.pdf
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_b550fd85ca3c4ff783628a16923e1710.pdf?index=true
    • 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_off0000ea12.bin
47a41f6b6746dbcc046af95f23320b679e251ac14731b89a42a38f73aec3cf68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 5064 bytes
font_01_sfnt_off0000fb38.bin
30206f9c1d7bb65884a13a4400a028c365deddad3c86c0b246aeb8661d26e0df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 10360 bytes

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