Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3807e96b79efb47…

MALICIOUS

PDF

73.0 KB Created: 2021-04-21 13:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 06afe15fa1516d66711d9de09533cbda SHA-1: e4a44aca92103cd2dad40f370a64d3ef7eb3d8a5 SHA-256: e3807e96b79efb47d53255f21d3fde5172830b42d6cd5751987315e7d7568c44
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the document's structure suggest it is designed to redirect users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=transition+words+for+paragraphs+2nd+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424026/normal_603cc8ec7dbf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476765/normal_604f78a8e5d4e.pdfIn PDF document text
    • http://fit-italy.space/epinephrine_davis_drug5yc2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482869/normal_5ff7bed78a558.pdfIn PDF document text
    • http://mp4.design/past_tense_irregular_verbs_exercise125g9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_606a03ecc4f98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477181/normal_5fc9521604f77.pdfIn PDF document text
    • http://pe50off.pro/komatex_pvc_datasheetqtgsn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_60654a8e0dbfc.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/jggtvY8/horror_film_movie_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/g5x8Vhe/asteroid_belt_definition_easy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_604d9db7368d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_6056aa164a872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikamavidasatam.epizy.com/28468776983.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_73a7e0c8531542bbaa054271d139b1fb.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_a75608ffa2e347ac8fafca84351e402d.pdf?index=trueIn PDF document text
    • http://sawulub.rf.gd/algorithmic_and_high_frequency_trading_download.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_bc56508d4f0b4f78b37b34285355ccea.pdf?index=trueIn PDF document text
    • http://buwozefavimim.epizy.com/arrest_reports_athens_al.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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 5444 bytes
SHA-256: c24f1ec0013fde41c86f07fbd3657d5c5fe611ee891861f1745086c9cc26fbd5
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 10680 bytes
SHA-256: 68a4eed8e63183249910f94bd8d592376b9d205e534d878138f95093248439d1

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