Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e547dda6f1bc2f…

MALICIOUS

PDF

69.9 KB Created: 2021-04-15 16:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7c196a65686a8c99bf2f900102723fa0 SHA-1: 6176c4031267a9ca19aff71d24c8d709d1d49581 SHA-256: a8e547dda6f1bc2f7d87f024cda5680aaa1d4e661d4c58ef3c9547efc0df9e9d
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious intent. It contains numerous external links, with 'https://botokaw.ru/strik?utm_term=tork+light+timer+parts' and 'http://domobifotuza.sportsontheweb.net/present_simple_and_continuous_text_exercises.pdf' being prominent examples. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially harmful external sites.

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://botokaw.ru/strik?utm_term=tork+light+timer+parts PDF link annotation
    • http://domobifotuza.sportsontheweb.net/present_simple_and_continuous_text_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_5fd60dab92550.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/49767637358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_604ec2883e07f.pdfIn PDF document text
    • https://cdn.sqhk.co/kinerufi/mijjehh/poguroreburomufafoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_605b979e6c534.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/4067896950.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvutose/geihYii/zawikodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_605320ac356e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_606e3a2060c7c.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/hhieHge/26686938746.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/O17fijX/70676218592.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/hi0jeSC/65221933750.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisenunab.rf.gd/37332217436.pdfIn PDF document text
    • http://wezikadedikenev.epizy.com/understanding_business_cycles.pdfIn PDF document text
    • http://gexazovaf.epizy.com/elements_of_effective_communication_textbook.pdfIn PDF document text
    • http://bulijisir.rf.gd/18341255127.pdfIn PDF document text
    • http://vedebimefawimad.rf.gd/microsoft_access_tutorial_in_tamil.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/14541119161.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/guitar_blogspot.pdfIn PDF document text
    • http://zukopura.rf.gd/thinking_in_java_source_code.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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 5244 bytes
SHA-256: 37442263e576871b72d2ba71529a65365a015c2a7693a44cb742d14ee7bebd6d
font_01_sfnt_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 10488 bytes
SHA-256: 2adb76697e5414523a6edd507163f6a9ecd17a1be4300cc2b54913c7262ded2c

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