Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb65371c1c1ddbbd…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 05:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18945ddd74e2fcb787703d5450671b91 SHA-1: 67c2b3a9733cf3a995f4c9c805a206914a544b37 SHA-256: cb65371c1c1ddbbd7431f6be49b9aa15efc96310dfd8e44df4d77b56b679289d
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm or phishing attempt. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

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://midufefew.ru/wix?keyword=black+and+decker+rice+cooker+instructions+rc506
    • https://kafedujewerom.weebly.com/uploads/1/3/4/6/134622586/tezasigixigaleg_mowezan_wurerupako.pdf
    • http://tehnopolis.org/87610738813x6fay.pdf
    • http://rimarilomikozu.medianewsonline.com/candy_candy_manga_espaol.pdf
    • http://rakadan.sportsontheweb.net/brandy_melville_free_shipping_december_2020.pdf
    • http://munasimowijuxi.getenjoyment.net/jogos_para_uma_aprendizagem_significativa.pdf
    • https://nidegezepon.weebly.com/uploads/1/3/4/6/134650885/d1cce56.pdf
    • http://youralteragoods.com/what_attack_on_titan_character_are_you_season_4jl1rw.pdf
    • http://tideparipawovu.mygamesonline.org/soundlogic_xt_keyboard_how_to_turn_on_lights.pdf
    • http://barajofa.mywebcommunity.org/kaxomamon.pdf
    • http://tukazijib.22web.org/wepilatovenufud.pdf
    • http://buyfastedcircle.xyz/89321122120td8v7.pdf
    • http://naturebiolog.space/whats_funny_on_netflix_ukp0146.pdf
    • https://wonelapafilujol.weebly.com/uploads/1/3/1/6/131606162/ratuwubow.pdf
    • http://ebay-coupon.ru/8184144322fmnps.pdf
    • http://vuvabadiredowa.getenjoyment.net/gilakazage.pdf
    • https://ranazujip.weebly.com/uploads/1/3/5/3/135398887/9f60fc8d9539.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://banugigo.epizy.com/dymo_letratag_100h_plus_handheld_label_maker_for_office_or_home.pdf
    • http://zizidizukokaruf.epizy.com/5e_barbarian_storm_herald_guide.pdf
    • http://voturugivorajop.onlinewebshop.net/77723525029.pdf
    • http://xofunuxemijowex.rf.gd/50608919748.pdf
    • http://noratev.myartsonline.com/academic_stress_scale_for_high_school_students.pdf
    • http://nejarisiwudu.atwebpages.com/vipaniv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ba.bin
48fd9a09a7e817d7286d3ee8577a92501c3e3dd55765c73515dcc4faceb241c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 5468 bytes
font_01_sfnt_off00010860.bin
9407e56966bf1393c49ed56f594fc9c7d08f63a74daa18aec5eab11f70240e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 11272 bytes

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