Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef96e6a23df366b9…

MALICIOUS

PDF

98.8 KB Created: 2021-03-22 21:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 812e372cbe874b9d3f44d78626d90ffc SHA-1: d06b707a9a70573ba99060c788b1e67710877d83 SHA-256: ef96e6a23df366b9e0b9274662c6fb9819db7dabf267b3cd132af46639ee0561
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a ML classifier indicated a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document is designed to redirect users to potentially malicious external sites, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/award?keyword=bsc+1st+year+organic+chemistry+notes+pdf+download
    • https://cdn.sqhk.co/tagodepa/fZM7gi5/swing_states_electoral_college.pdf
    • https://cdn.sqhk.co/bisuligiga/VlOhdgh/79688532237.pdf
    • https://cdn.sqhk.co/navotezive/3OohiLW/60476872672.pdf
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdf
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/caf449b622e7e39.pdf
    • https://cdn.sqhk.co/lovojekaboxi/hgdw7gc/yeezy_boost_350_v2_zyon_shirt.pdf
    • http://fortuneo.best/dexaxotuwesibbros7.pdf
    • https://cdn.sqhk.co/futevanu/jGZ5LbU/merge_farm_rustic_pond.pdf
    • http://mestikon.online/vopevomadakobolg87b.pdf
    • http://gatowixipeba.mywebcommunity.org/art_models_5_free_download.pdf
    • https://cdn.sqhk.co/kinibemazoz/Sg0hgaU/candy_crush_soda_saga_app_download_apk.pdf
    • https://cdn.sqhk.co/xulawajikigi/hiticjc/7621997021.pdf
    • https://mozimokitazipa.weebly.com/uploads/1/3/1/4/131407977/gokitu.pdf
    • https://cdn.sqhk.co/sesakiwewe/Mgi4aih/fuvimovapigekemopena.pdf
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/3751210.pdf
    • http://counterman.ru/pipoluguvowerewurotemowuvgka8l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://tigagatu.atwebpages.com/xobafabobufilewifal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001160f.bin
5fe2e1083b9c3d56ca8cd0abde961410bf13e4f96418855319d7eb5ea73c1999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 5864 bytes
font_01_sfnt_off000129f7.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 1800 bytes
font_02_sfnt_off00013284.bin
82a3e986bd67b4ecd5fb4583a14ac1a3bd2620edcc2b4390dd01c55e203efe96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 11716 bytes
font_03_sfnt_off00015a7f.bin
753ef9857e66d820834cce6475225909bfee7ead41f071df93b2ea5436bdb59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7F 10708 bytes

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