Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4df7b5a2cea089b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-07 23:37:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3bb93ab89ebc053ce9bebc533a83afd7 SHA-1: b6c879811d3f5952c522f3d4fb01b8d20d52cebe SHA-256: c4df7b5a2cea089b05137d520b409fecee242327bde15916bc2a8c29ecd53309
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, with several pointing to disposable domains and acting as link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation, but no direct user-facing content that would explain the malicious links.

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://pelibifir.ru/aws?utm_term=predicas+cristianas+el+poder+de+la+oracion PDF link annotation
    • http://evakuator-uga.ru/35120813698av0ow.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/what_are_the_four_original_navajo_clans.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/v5jbjeQ/79879217818.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/rufowifiwugewipiwoxevi.pdfIn PDF document text
    • https://cdn.sqhk.co/xadopazo/iN7gcii/denekoxebizugigotixowigap.pdfIn PDF document text
    • http://fishland.store/28169144077p5x42.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/iwiihYe/kofidubefapiri.pdfIn PDF document text
    • http://nuverlites.online/how_to_upload_a_on_wixku9z7.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/sezuka.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/7ih8aXM/among_us_character_colors_personality.pdfIn PDF document text
    • http://classkaod.ru/lenovo_yoga_c640_specsyuz0y.pdfIn PDF document text
    • http://losinglotterynumbers.com/how_can_i_be_in_charge_of_my_own_happiness29mgp.pdfIn PDF document text
    • https://wepopoxewu.weebly.com/uploads/1/3/1/1/131164118/4483519.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/the_half_has_never_been_told_criticismf71ev.pdfIn PDF document text
    • http://tk-pobeda.site/22542248745c1s7p.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/Mhecigh/pumobugetawenupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_35e092b8cffd4da9872c408841b65270.pdf?index=trueIn PDF document text
    • http://fanalejowegop.atwebpages.com/toxixomalelowipid.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_dee857bbbcd145b19b56922c4df8c0a4.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_0d7e51b575194a29babde9aa43065ad6.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_4b6acb4291e8446b9064709e27d1c90e.pdf?index=trueIn 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_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 5068 bytes
SHA-256: 40387eef27d458bbc960f6aa44692d072f1e75d3da160dc7079fa6fd766e120d
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 11460 bytes
SHA-256: 46f51f845978e0a238738854700c00dce3dbfd7ee52a3ea78b1676090abc2161

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