Malicious PDF — malware analysis report

Static analysis result for SHA-256 929aa1bf29c07913…

MALICIOUS

PDF

77.8 KB Created: 2021-03-31 23:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68d8fc1c6c21040e4a30575fd424a9b5 SHA-1: bce3f3e77da980089f88ad958a19405b499f8e7f SHA-256: 929aa1bf29c079131856d0f4cd36328de74037f723ca50fd7e11ce00d9195989
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicative of a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=can+emdr+help+adhd
    • https://cdn.sqhk.co/keserina/ahd5aku/screen_time_control_app_iphone.pdf
    • https://cdn.sqhk.co/robimovule/jdhghew/fall_cake_decorating.pdf
    • https://cdn-cms.f-static.net/uploads/4480895/normal_604365a90b109.pdf
    • https://cdn.sqhk.co/fasotaluvose/fjhighb/toca_life_neighborhood_aptoide.pdf
    • https://cdn-cms.f-static.net/uploads/4482403/normal_600af27a1decf.pdf
    • https://static.s123-cdn-static.com/uploads/4454665/normal_5ff03d58ebf38.pdf
    • https://static.s123-cdn-static.com/uploads/4476757/normal_5ff1cbb1d86a4.pdf
    • https://cdn.sqhk.co/kusamika/cjdicgi/mountain_bus_simulator_3d_game_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tesodagiwor/73376568622.pdf
    • https://s3.amazonaws.com/jejulurowev/76942005538.pdf
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_d47e8e09a63241ff892811a35c92bbdb.pdf?index=true
    • https://s3.amazonaws.com/vidadaviwal/80724708379.pdf
    • https://s3.amazonaws.com/pazatuv/puretobevoxemuv.pdf
    • https://s3.amazonaws.com/fadobirak/15301428275.pdf
    • https://s3.amazonaws.com/zerejibixupav/nibazapam.pdf
    • https://s3.amazonaws.com/gogoxowiniza/blog_website_template_css_free.pdf
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_08c9d285544a48589be22d9c0cd35a9d.pdf?index=true
    • https://s3.amazonaws.com/fadupazageraf/beer_game_girl.pdf
    • https://s3.amazonaws.com/zafirawit/dog_friendly_pub_guide.pdf
    • https://s3.amazonaws.com/lixasifasi/82965464753.pdf
    • https://s3.amazonaws.com/xidazeze/excel_date_today_format.pdf
    • https://s3.amazonaws.com/mogedozara/panasonic_genius_microwave_manual_demo_mode.pdf
    • https://s3.amazonaws.com/muvojugejoxip/archery_games_for_android_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e0.bin
128807f5fe34d78422424dde56c9969f7153c7ecf93108fc2e4b32203c456516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 4596 bytes
font_01_sfnt_off0000f838.bin
1d0921600f30245c2bafe4c251db23357cf8ac653e19bb38d143b36ba1e645dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 10452 bytes
font_02_sfnt_off00011bf0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 4324 bytes

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