Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6ca72909c6f723…

MALICIOUS

PDF

78.3 KB Created: 2021-03-27 10:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4f8f483b7a19342f651d747926d04aa6 SHA-1: b8104dcf38fe15b7340504ebe434b9fa6579adfb SHA-256: 3e6ca72909c6f72394f9dae8e95743b8f71ccb1bc00ac21e779cdadcc816df80
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, 'midufefew.ru', which is likely used to host a malicious payload or phishing page. The document body, though heavily obfuscated, suggests a lure related to educational content.

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
  • 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://midufefew.ru/123?utm_term=multiplying+fractions+worksheet+3rd+grade PDF link annotation
    • https://cdn.sqhk.co/dokamaruxif/hdibgjV/comunicazione_e_civic_engagement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_604a67bbda698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_5fe9cf9ec4823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5fddb5b035cd9.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/ZvIJhia/skylink_live_tv_sk_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/gumojitoxowu/jbXjbhc/52892244790.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/dgidjji/sewotumaxinugudebewolux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5fcf379324e7b.pdfIn PDF document text
    • https://cdn.sqhk.co/gadakoferupa/6Kvietg/25873209051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_601c686dcede9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_603037fe992b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_cc9201ea94a74bf3b82d857f455087b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/nfl_fantasy_cheat_sheet_ppr_league.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_b243309063a24473b7abab4908af659c.pdf?index=trueIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_611f7fb9f6e548d28e0046c121336f08.pdf?index=trueIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_f34b9beb833f4018813a5d6ef8543aef.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_fa3dae602db549d6b514ccfbbd34757d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/ion_profile_pro_usb_turntable_drivers.pdfIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_06d01943c0494378b2c957123a684880.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/gedeckter_apfelkuchen_mrbeteig_springform.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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 5844 bytes
SHA-256: 38255731a7dbba93fb89ecda2c82fcda10ac21731e2632c27c154bb744dab139
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 10772 bytes
SHA-256: 2744f8b823edfb8a68a0815b6860d6c00b5a53d86e22d99fe792d024dea3573f

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