Malicious PDF — malware analysis report

Static analysis result for SHA-256 6937ff6f32ecf8e7…

MALICIOUS

PDF

82.9 KB Created: 2021-03-04 23:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c977be267e442d016ccef364d80da98b SHA-1: a0c13da87d03df7dcd073176336c433f6da1cc5e SHA-256: 6937ff6f32ecf8e768ecf9ecacd380faa38e90acdc15c58a60254b925fc48aea
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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/123?utm_term=navy+advancement+time+in+rate+chart PDF link annotation
    • http://zizodoroluxonaf.sportsontheweb.net/1._what_is_the_general_data_protection_regulation_2018.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/monsters_inc_theme_song_earrape_download.pdfIn PDF document text
    • http://tawaguf.scienceontheweb.net/contabilidad_de_costos_libro.pdfIn PDF document text
    • http://klosheff.xyz/jazz_bass_solo_scalesmjdu8.pdfIn PDF document text
    • http://trelon.fun/maxitezusagavewaxekaddjas.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/L18tuhd/12208381028.pdfIn PDF document text
    • http://sawumivulopajud.22web.org/android_studio_navigation_architecture_component.pdfIn PDF document text
    • http://soluzixod.66ghz.com/66492850254.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/jiddugi/xasupetegijogomufo.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/71614238631.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/d3vhcij/fun_general_knowledge_quiz_buzzfeed.pdfIn PDF document text
    • http://rodina38.ru/admission_form_of_sainik_school_dehradunl1glk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_654f2350ebd44d5d806fb76007de1fd1.pdf?index=trueIn PDF document text
    • http://nejarisiwudu.atwebpages.com/vipaniv.pdfIn PDF document text
    • http://nedugone.epizy.com/assembler_photoshop.pdfIn PDF document text
    • http://jowunimigafej.rf.gd/how_to_connect_2_ue_megaboom_speakers.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_580558ecbed44bbd9e111dfb92e6d550.pdf?index=trueIn PDF document text
    • http://bawaluzobadomi.epizy.com/pin_bar_candlestick_pattern.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_2514a1863dc64da4955cf0af49890ba8.pdf?index=trueIn PDF document text
    • http://junedujivoxoz.epizy.com/love_story_violin_piano_sheet_music.pdfIn PDF document text
    • http://xazejove.epizy.com/rilidotoviwitekug.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_off00010930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 5100 bytes
SHA-256: de211f43755be10180fcc4ef8eb4aafa0bb24d881c0d3f408b87e016162578bb
font_01_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 10556 bytes
SHA-256: fbdd7a1ec281d122f62d7ebf88731eaffc85ed768e5bfebd7531789df85d642a

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