Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53a375590481de9…

MALICIOUS

PDF

80.6 KB Created: 2021-02-25 23:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed610fdeb54aada4878643aaf068635b SHA-1: d417cfc0627328186d4c6f7c452ff9cfc208b290 SHA-256: a53a375590481de9fa9aeae8f940336d4c7e084cbf83b345eeba58f57d6bc192
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware delivery attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a lure related to 'french cooking', suggesting a social engineering pretext. The presence of numerous external URLs, including one pointing to 'jacksth.ru', indicates the document's primary function is to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

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://jacksth.ru/strik?utm_term=race+to+master+the+art+of+french+cooking PDF link annotation
    • http://centerverifybadge.com/the_story_of_my_life_casanovayh94h.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/LigECft/kokiwirejunijeditowo.pdfIn PDF document text
    • https://cdn.sqhk.co/gadujotev/jg6r2ii/nuzoxanoguseka.pdfIn PDF document text
    • http://abwaab.su/66460821384d5ult.pdfIn PDF document text
    • http://chempion.coffee/51346505339qq8gp.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/fIjafhD/wetadumugekabu.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuxedodi/igg1weQ/kebogipokowetobopujot.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/fidefofudi/wolaloxepafoboxovojewil.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/fafuvilagiluzugani.pdfIn PDF document text
    • http://ritabodaxitex.epizy.com/dalata_hotel_group_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/pamaxinozidatov.pdfIn PDF document text
    • http://metuvubom.rf.gd/18248089024.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/89185750337.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_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 5332 bytes
SHA-256: 346786f55446564f1dc8316076a22a2a96e9a6c8461c4fdc5552f4a1148992df
font_01_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 11972 bytes
SHA-256: 3c99bcc3201cb50c7ca1f254d896fc6838dd15fca192b4a54cf5551569dc739d

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