Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bab5c21e866300d…

MALICIOUS

PDF

84.0 KB Created: 2021-03-02 08:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd6160d4fc8394e38de3477232f3df9e SHA-1: b52232e3fc200971e64e80ea42c98883719be183 SHA-256: 1bab5c21e866300d9b2edeaac715eeba11b42c000da754788706e40c05fb585b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other suspicious domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, contains text related to Fitbit devices, which is likely a lure to direct users to malicious URLs like https://nipisod.ru/strik. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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-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://nipisod.ru/strik?utm_term=why+does+my+fitbit+flex+have+2+blinking+lights
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/7966770.pdf
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/8f2c969f5517c4.pdf
    • http://maxefeb.iblogger.org/52543822838.pdf
    • http://letgtma.bid/chick_fil_a_nutrition_spicy_chicken_strips3lgza.pdf
    • https://sipizoreju.weebly.com/uploads/1/3/4/1/134131451/6867449.pdf
    • http://povulofi.mywebcommunity.org/pioneer_vsx-521_factory_reset.pdf
    • http://davupopebuwiser.sportsontheweb.net/89789422310.pdf
    • https://satepiwe.weebly.com/uploads/1/3/5/3/135350267/togufuvukos.pdf
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/a2b9a6bb22db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tuxexi/feboxixotes.pdf
    • https://s3.amazonaws.com/davawina/blood_pressure_tracking_app_android.pdf
    • https://s3.amazonaws.com/forupokisip/pusoboroxozili.pdf
    • https://s3.amazonaws.com/vofadoloves/being_alive_sondheim.pdf
    • https://s3.amazonaws.com/pavujiniz/architecture_presentation_sheet_photoshop_psd.pdf
    • https://s3.amazonaws.com/xafaxotaful/52440353662.pdf
    • http://duvodix.myartsonline.com/mavagijamiwimomapigo.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_off0000fa6d.bin
ff91ea114fa1d9e40e8ad566c503d4a1762cf72bd186a126166bb7a8156d946a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 5592 bytes
font_01_sfnt_off00010d79.bin
fd3e91377a152d0cc425b872fcb3571889b13a5d315ccf76b2806bebe22e2c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D79 11432 bytes
font_02_sfnt_off00013462.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13462 4324 bytes

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