Malicious PDF — malware analysis report

Static analysis result for SHA-256 3886878d5695c4b6…

MALICIOUS

PDF

75.2 KB Created: 2021-05-05 19:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ac060d3ad18df3dfdecebf53f5e0cae1 SHA-1: e90811a80418af5d8e5d3097bfe970ab67be2939 SHA-256: 3886878d5695c4b6076ac234b8536f38554a9f894ff9f75394af4b2c5f80a725
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure-based attack pattern.

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.
  • 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.
  • 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=walt+disney+world+tickets+prices+2021 In PDF document text
    • https://cdn.sqhk.co/juwafajem/N2hf5r4/76269472726.pdfIn PDF document text
    • http://logvoz.ru/how_do_i_adjust_the_time_on_my_casio_watch12azn.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/9khiZSK/gatawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_5fdafeca09897.pdfIn PDF document text
    • http://retys.space/samsung_rfg297hdrs_service_manualwrw4j.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/whajahj/breast_reusable_face_masks_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/zXGiehi/kufexexujijigejugubo.pdfIn PDF document text
    • http://wokodanib.getenjoyment.net/potumenexelujinib.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/lGgjjf6/greatest_hits_of_the_50_60_and_70.pdfIn PDF document text
    • https://cdn.sqhk.co/faxenukev/ihjLHja/girl_crush_lyrics_rico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_60316a3ddf504.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/gegijhV/62204923327.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/98102098499.pdfIn PDF document text
    • http://ita-talia.fun/5591908310659jeh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_603c112f2988f.pdfIn PDF document text
    • http://avit0.pro/offline_dino_game_high_score44sf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimoviranonaf.onlinewebshop.net/38670263911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d945efd-9f87-4e17-a64f-2b67352f0bca/kipamivulikano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4376cc75-7c6a-4a76-b7fb-f3ffb4dfd5cc/how_to_build_a_straw_man_proposal.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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 5664 bytes
SHA-256: fb0cc76326a2e4b12d8550c5331310230f4c64a4a57d5154d964301f91be24fc
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 11232 bytes
SHA-256: 529272dece45ddfd3d3466f5327c68772873b255a1a2cc6a8185a9294ae22cb7

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