Malicious PDF — malware analysis report

Static analysis result for SHA-256 919740a57ba6e025…

MALICIOUS

PDF

86.1 KB Created: 2021-02-27 04:54:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9cc2c33716c1e154e08b64a7c2570a81 SHA-1: 72a85d3155dc4341fa8a8548e768d6c5fbd55ea5 SHA-256: 919740a57ba6e025ce15bf78a74778e441e24aed2209d7830b6e54155650ac6f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://yafferge.ru/award?keyword=bram+stoker%2527s+dracula+movie+quotes+gary+oldman'. This indicates a phishing or social engineering attempt. The ML classifier and ClamAV also flagged the file as malicious, supporting the phishing pretext. No scripts were extracted, but the presence of malicious URLs is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/award?keyword=bram+stoker%2527s+dracula+movie+quotes+gary+oldman In PDF document text
    • http://rcasino.info/5918196703847v40.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/LhbvkQp/linkedin_application_developer.pdfIn PDF document text
    • https://cdn.sqhk.co/nadoranur/agchhUB/31337360044.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/jedibb2/gakutavofavademe.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/how_to_self_clean_wolf_electric_oven6yenu.pdfIn PDF document text
    • http://invitesistem.ru/pomeluxedejeridodebavaamciz.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/gjjzgfC/wadetasisutakorop.pdfIn PDF document text
    • https://cdn.sqhk.co/digubamot/ThfSgdw/bariwefanubadivosososajux.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/igjd7ie/idle_construction_3d_apk_android_oyun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/eQ7ddaM/download_game_glory_ages_samurais_mod.pdfIn PDF document text
    • http://thedefenseforge.com/varudumogikokizolvu99i.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/BTd6Iif/67445489315.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakasis.onlinewebshop.net/what_kind_of_jobs_can_mechanical_engineers_do.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 5692 bytes
SHA-256: 45f4007a221d33796548c5f67ad1fc4e48efe500725bc4729e1b5014cf32d39b
font_01_sfnt_off000127c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C2 10592 bytes
SHA-256: 7e8218620fcc6bc8d6b93fd7ee96916b332c2f78838dadafafbd569ff3f3d70b

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