Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1faea72c5aba01…

MALICIOUS

PDF

81.5 KB Created: 2021-03-14 11:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b994444bb17eb7403954a814711e10ed SHA-1: ae9207fa2ebf7f36eb6cd2e48513ccb4d3d66481 SHA-256: ed1faea72c5aba0195ce2192b82f82b4e2291158e36972a80d3ecebf1ae83b54
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to 'vilenefex.ru', suggesting it's designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is part of a scheme to host many links on disposable domains, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=casio+g+shock+dw9052gbx PDF link annotation
    • http://liniwugo.iblogger.org/17610214568.pdfIn PDF document text
    • http://lukaruji.iblogger.org/48344702284.pdfIn PDF document text
    • http://soldonlittleton.com/707773719588gsqu.pdfIn PDF document text
    • https://fenatinuzari.weebly.com/uploads/1/3/5/3/135314561/vajumenamigigeluw.pdfIn PDF document text
    • http://tehnopolis.org/kung_fu_panda_legends_of_awesomeness_theme_tune2o32h.pdfIn PDF document text
    • http://top-shop-store.website/kajizotatanepidofajaczndr.pdfIn PDF document text
    • http://uscreditscore.info/wesivetujavobodubakuseg5yr8z.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/c7dbcc3.pdfIn PDF document text
    • http://shimano-stradic.ru/kizoxu2s4df.pdfIn PDF document text
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/pikef.pdfIn PDF document text
    • http://dezlice.ru/36649089828fg3b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f26bf2a3-b996-4a71-b10f-c7b7cbebac91/sig_p226_review_nutnfancy.pdfIn PDF document text
    • http://pirokogux.epizy.com/roluwutixiwe.pdfIn PDF document text
    • http://bajaxugezozego.rf.gd/bible_study_books_for_young_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf200d7-2c0e-4011-ad5c-83399207e412/30219245908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e898e7f-0249-4a6b-a79b-f2d7ee7b7ff9/its_kind_of_a_funny_story_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0faed0f-db92-47a3-a561-d2c92ef9dcfd/world_map_outline_tattoo_ribs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96be4aba-f004-4816-997a-9fbf039b1f43/public_relations_degree_open_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd26340-b031-4139-a35c-1c93472f4e70/14580792424.pdfIn PDF document text
    • http://waxivapisisan.epizy.com/antonyms_and_synonyms_word_list.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_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 5896 bytes
SHA-256: 8ec75f59ea4f4a7b9e239390ff76cc41fa3f79c414ba6e8d72a4ebc774af3d7f
font_01_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 10836 bytes
SHA-256: 55510e3bf8ff949c909611d86f27a807306691ca278ede3e8e242ce2abb7c2b3

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