Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae242455d0f03c9c…

MALICIOUS

PDF

69.3 KB Created: 2021-02-27 04:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9d67c5056b1e69da97fad9d64bf2662f SHA-1: 47728a4de388ae2964752dd9446ae7e37b0b8709 SHA-256: ae242455d0f03c9cca98ee0d0740ccec015485e9f6a533a20dcd803415edc421
182 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://crophysi.ru/award?keyword=how+to+find+your+tv+model+number', are designed to lead users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9656

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/award?keyword=how+to+find+your+tv+model+number In PDF document text
    • http://korogesubelokut.mypressonline.com/what_stocks_to_watch_on_robinhood.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/risitoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/8tVuXhc/best_razor_prank_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_5fe78ae9573c3.pdfIn PDF document text
    • http://mmmuuuue.space/street_fighter_4_apk_all_charactersx8247.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/Jjdhjb0/63265340749.pdfIn PDF document text
    • http://runmasten.online/arifureta_light_novel_indoy4n11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_60150293dfff5.pdfIn PDF document text
    • http://clientesdkb.com/black_skin_tone_shadesv0wot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450504/normal_5fc7663bd37f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_6019ba91a63d8.pdfIn PDF document text
    • https://cdn.sqhk.co/zamodozitip/jjxjhhf/sitijezesibekude.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/braun_coffee_maker_error_e01.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/rising_stars_maths_year_6_answerso9olw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_602727d39f0d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480581/normal_5ff674876e2d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerujafulo.rf.gd/call_blocker_app_apkpure.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 4904 bytes
SHA-256: 67212458039044a02e52031863a2b21344856760edea824eab5ead297c1a04ea

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