Malicious PDF — malware analysis report

Static analysis result for SHA-256 a398deef93105459…

MALICIOUS

PDF

70.4 KB Created: 2021-02-22 09:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6fd8931f7241e97a97a1174b62dcd544 SHA-1: 83afa405e196f48a55bfa4d9f57a01658387eeeb SHA-256: a398deef931054598fe9cce801323774ac8cda95cac49156652e5c73e969f0b9
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URL `https://yafferge.ru/strik?utm_term=uft+retro+pay+2020` is the primary indicator of compromise, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=uft+retro+pay+2020 In PDF document text
    • http://nanolenka.xyz/58748817984iiwym.pdfIn PDF document text
    • http://gokojemisivuf.22web.org/best_answer_of_how_have_you_been.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/ebjjNTU/godus_no_more_voyages.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/2w2wbNm/sling_tv_channel_list_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/iiRoxgg/homeschool_schedule_template_word.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/vunuwisegajz6ak.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/ihghdhj/59209730679.pdfIn PDF document text
    • https://cdn.sqhk.co/tisorobew/hfOogjm/throne_rush_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/ghghwij/46206947137.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/gyjagfy/4524498923.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/IjaIwij/amazon_cyber_monday_toys.pdfIn PDF document text
    • http://mivetys.xyz/how_to_bounty_hunt_rdr2_online2y0ts.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/hgvYjj4/no_button_jeans_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/e0cijgj/tabletop_fountain_pump_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/bhgfjgM/kijizil.pdfIn PDF document text
    • http://natlegend.space/kexitavefivominomisesoqytqy.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/fkghjbW/36881377862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipokogave.epizy.com/60119877348.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_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 5052 bytes
SHA-256: 4c41a0b374a45d0a56de3a82eb5cf1d1c89f91ddac5b0b72a2193baddd52988a
font_01_sfnt_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 11040 bytes
SHA-256: cb80c948277f7ce09bf8daba2bc4d8e973202772d443050c0a72cb3bf8258102

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