Malicious PDF — malware analysis report

Static analysis result for SHA-256 225d3ac9b6a0dfc3…

MALICIOUS

PDF

87.5 KB Created: 2021-03-14 19:34:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d2ae21582fd67f01b903bd68603e6c95 SHA-1: da0cd7d4a3fd20acc765a7f8da51246adc10343a SHA-256: 225d3ac9b6a0dfc341065999a09e7e2d5b15eaa3a97ce61251b94ceda1ca41f0
192 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'dafemum.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious link and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a phishing or malware distribution lure. The document body is heavily obfuscated, preventing a clear understanding of its specific pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/award?keyword=ccna+wireless+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_5fe8918b21869.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/xudanikonivik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_602b671c4e90c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487005/normal_602b2b28d708d.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/what_spices_are_in_togarashi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_601de087deecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_602098405dbd8.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/bacteria_bacillus_thuringiensis.pdfIn PDF document text
    • http://konolux.medianewsonline.com/braun_coffee_maker_error_code_eo1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384461/normal_60047c0f8e96b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/65628978179.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/leather_carry_on_luggage_with_wheels.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/maparolekuwokujon.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/49_lyman_st_brockton.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/tinekuguzofevevibotiniz.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/xudigamifapibogigixukize.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/centrifugal_pump_calculation.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/budgetary_and_non_budgetary_control_techniques_in_management.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 2912 bytes
SHA-256: 1baa3efd180cf5f44d613abe34ea0380c2d25dd221f4ef864ac418d56f73cc35
font_01_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 5148 bytes
SHA-256: 016634080b8eb87d6f1e2b054935d9faae3769542b739391ec11bc32c6f832eb
font_02_sfnt_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 11428 bytes
SHA-256: d197d042cd94bed3be6fe048adf142399b2afa275d8296d35b960744e07177e7

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