Malicious PDF — malware analysis report

Static analysis result for SHA-256 f856715bfeab5cca…

MALICIOUS

PDF

71.4 KB Created: 2021-02-20 21:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 81e61a1a99525ff3214e6a99d066ad00 SHA-1: 659e6e76df3e355e097a9765c25d55e2e38b8a7e SHA-256: f856715bfeab5ccae2d91e8411819c19d86fb311603a8b209b168679256abc95
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=contemporary+business+17th+edition+pdf+free'. This indicates the document is designed to trick users into clicking the link, likely under the pretext of downloading a business textbook, which then leads to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wix?keyword=contemporary+business+17th+edition+pdf+free In PDF document text
    • https://cdn.sqhk.co/lopedovev/tigijUm/peppa_pig_golden_boots_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410965/normal_5fe38296e0bee.pdfIn PDF document text
    • http://aydym.club/whole_brain_power_bookgism0.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/hcWiYtE/rojezubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_600be6a276191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_6013b7877dd2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466664/normal_5fe50202a4cda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5feb76bae2b92.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/wDvThjB/descargar_vl_video_player_iptv.pdfIn PDF document text
    • https://cdn.sqhk.co/kilalovuge/d1iagia/48459222053.pdfIn PDF document text
    • http://stonersfranchise.com/bahishti_zewar_banglav1jyd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482415/normal_5fdf025d4013a.pdfIn PDF document text
    • http://promooffer.site/xanonapigidirelanuxedsma2x.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ihsgfgh/29026330188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_601c859b84e28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/restaurant_honfleur_guide_michelin_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/bharat_film_songs_video.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/xutufe.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/ppt_on_barriers_to_effective_communication.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 5528 bytes
SHA-256: e394613eb82ceeb8eff43ad904a41f27ff0f5ab9f0d6ac282f30287828fa17fb
font_01_sfnt_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 10532 bytes
SHA-256: f51cd4df6dde57114ded11fc2d4d68476facbf51bd6b9e9f274e871e1be74db0
font_02_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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