Malicious PDF — malware analysis report

Static analysis result for SHA-256 5786d55a97488ebc…

MALICIOUS

PDF

79.3 KB Created: 2021-03-21 11:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80f3b4b39ba6901c00bb9a390f6101bc SHA-1: 1ce08d5fee4e26615f5fd65b7fe150a80c8ba45e SHA-256: 5786d55a97488ebc421666ddc42f3c4c9a69eec73a04486454bb1b8b846e0278
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 of which are hosted on Weebly and CDN domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to printer issues, likely serving as a lure to click on the embedded malicious links.

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://nipisod.ru/strik?utm_term=hp+photosmart+5510+won%2527t+print+color
    • https://vatemiseviweriw.weebly.com/uploads/1/3/1/4/131453097/fikamaxapativimowodu.pdf
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/sipujuni.pdf
    • https://cdn.sqhk.co/wexifidobafo/gejePSl/musica_disco_delos_80_mp3_para_descargar_gratis.pdf
    • https://cdn.sqhk.co/vobevufubito/Q4YggRj/escape_plan_2_review_imdb.pdf
    • https://zebomutob.weebly.com/uploads/1/3/2/6/132696512/sujiwafowipo.pdf
    • https://cdn.sqhk.co/tavaxikanabu/ehiPgfw/93634621669.pdf
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/wuzikebom.pdf
    • https://cdn.sqhk.co/dasewugiru/iM8zYSw/89205118860.pdf
    • https://cdn.sqhk.co/felolavap/DAC8gjA/ice_wolf_3d_wallpaper_download.pdf
    • https://cdn.sqhk.co/wadebekop/hX6hfjf/artin_slot_car_website.pdf
    • https://minizejemeroro.weebly.com/uploads/1/3/2/7/132740725/8778696.pdf
    • https://cdn.sqhk.co/kominepoli/V5ja6lx/silojipegarovutogud.pdf
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdf
    • https://cdn.sqhk.co/mivijigonof/hdYjjmd/38512141290.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tebexuvizo.rf.gd/biotina_esmalte.pdf
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_f7cae52bbbf24dcbb5bcf9ca84fd6950.pdf?index=true
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_71c2309247224a808721c7f4aadb72b1.pdf?index=true
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_aefb1eb6023140ed8dde0615d361ff97.pdf?index=true
    • http://dumizalu.epizy.com/didajusomivalubupezo.pdf
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_2b973171c2994c9db689c08df1bcffa5.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_off0000f66d.bin
5d875d9762f158ef6bf96a3c174da639626350fd3dd2d5de4b48615c41c95303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 5576 bytes
font_01_sfnt_off00010955.bin
d066cff0e7f3e0d91926289f1ae487a19f79deeffcc8bc4a85e4dadd13204ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10955 11292 bytes

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