Malicious PDF — malware analysis report

Static analysis result for SHA-256 08771240c44664ed…

MALICIOUS

PDF

100.3 KB Created: 2021-03-21 06:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6653ff5c8ea67be1dcf91bca2a79b96 SHA-1: d7ba60c1a93602891a291e2560efd98d495adb16 SHA-256: 08771240c44664edc08dd5783abd98881bf841603fdd5e6b95d2ffac51bbfe5b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting and leading to a URL that appears to be part of a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the presence of obfuscated document body text and the nature of the embedded URLs suggest a phishing or redirection attack.

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://nipisod.ru/strik?utm_term=what+was+the+tallest+giant+in+the+bible
    • https://static.s123-cdn-static.com/uploads/4482623/normal_5fc728d7a9f07.pdf
    • http://xinuvaro.sportsontheweb.net/barron_s_sat_chemistry_13th_edition.pdf
    • http://zagejudivavi.sportsontheweb.net/48148252755.pdf
    • https://cdn-cms.f-static.net/uploads/4446633/normal_5fd3c09cb4e2d.pdf
    • http://bovewitavivebu.getenjoyment.net/las_mejores_universidades_de_bogota_2019.pdf
    • http://linavaluviriv.getenjoyment.net/78744639328.pdf
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5fd03e8c19c78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zodererezuzuxi/wamusiwujudefu.pdf
    • https://s3.amazonaws.com/lezopobigeza/dyslipidemia_guidelines_2018_algorithm.pdf
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_852e841bf4d040c1a2bffb633efd2cb3.pdf?index=true
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_853dcb104df049479a6768dc908dd91f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a5cec8c-80f4-4e04-84c6-78aaf56f3bac/57809490529.pdf
    • https://s3.amazonaws.com/niporofez/1689_london_baptist_confession.pdf
    • http://mekasesajiw.onlinewebshop.net/zexobikeb.pdf
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_26d2160d6e194a9bbaa7c92e71b603f4.pdf?index=true
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_962d2c16a98a4212965f9bdef355d0f0.pdf?index=true
    • https://s3.amazonaws.com/daraniwekamidir/rodapezuberabeg.pdf
    • https://uploads.strikinglycdn.com/files/ce7ac43a-6bda-4f9d-908c-8355e5896b06/uniden_bearcat_bcd396xt_programming_software.pdf
    • https://uploads.strikinglycdn.com/files/892e93b9-1e8d-42c4-b12a-830e7e33062d/motivix.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_off000148d7.bin
ad23ffbb4c5e206fefa703c3cbef6964bdbd05485477af5725d29feee96c7097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148D7 5096 bytes
font_01_sfnt_off00015a49.bin
c3de4bd236020d79701da00fee9f269b8a1ad5699b3ac5c7714d483c2ae7c60a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A49 12496 bytes

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