Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6ad71debe8c934…

MALICIOUS

PDF

84.1 KB Created: 2021-03-23 11:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 193688282cc18148356e084922bb5660 SHA-1: 4d3f166435b5968181a373375424fa00b4e323fa SHA-256: af6ad71debe8c9341b06950676f425fc9816801a30d5eeae6f1dbee14a5035e9
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Shadow movie quiz answers'. The presence of external URIs and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/wix?keyword=shadow+movie+quiz+answers+level+2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391921/normal_5ff7dcca4966f.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/b7ng6ha/zemegiselux.pdfIn PDF document text
    • https://cdn.sqhk.co/wanowofimaz/njcqghC/43405417865.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/best_arrow_weight_for_55_lb_bow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_605248fe905a3.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/Vibhigg/ball_brawl_3d_mod_apk_unlimited_money.pdfIn PDF document text
    • http://retoxen.mypressonline.com/68726132596.pdfIn PDF document text
    • http://suwetobolubujub.getenjoyment.net/periodontitis_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5ffcb7e1cfebf.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/hghdihl/mawuketuvidesiletulor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_6050ec0bf2410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5ff34db67d668.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_3b3ca55677274afea330683d7a781cfe.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_1c8b29a9366e46a1b03831657833fe42.pdf?index=trueIn PDF document text
    • http://suxudogakol.myartsonline.com/xitepobixaw.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_2009eb26a6e648b8b1bf203bddddbf24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f85426-984b-4b83-9f37-c0f9b69b4f44/voguturagugodatagene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff513ff0-4ad6-493e-8b06-777ee164b825/25767690702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b91fe53-3bb4-43e3-8f22-068a9e13cc50/gangnam_style_full_hd_video_song_download.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/yamaha_mg166cx_user_manual.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_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 5628 bytes
SHA-256: 8636f8603112a837ac41a773fc06775964eea9778c617a75769c695fa4a14ba1
font_01_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 10632 bytes
SHA-256: 8dda6c99c2779dacc559fb2028408baf495c2a918b1bd24d1f65d125e3b6fe97

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