Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f6d488477942fd…

MALICIOUS

PDF

77.6 KB Created: 2021-04-09 07:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 444a42f5aeadd3c7f12efd4d3952f998 SHA-1: 4fc1d10b4e2f80f89acdf8cea7bd5a6dcf1723fb SHA-256: 74f6d488477942fdb48a1b2d11771c60c28dbaf34ca70e842cf95adfc8d31c5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a link farm on disposable hosting further supports a malicious intent. No scripts were extracted, but the structure suggests it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://vilenefex.ru/strik?utm_term=microeconomics+textbook+mankiw PDF link annotation
    • https://cdn.sqhk.co/panajevem/gh8gdgd/tifufebunor.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/s84hjkQ/bipigok.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/gfuge7l/avengers_cartoon_movie_in_tamil.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/b3aae037b68faf.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/hf6xKhi/hyperspace_game_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/gjdbZib/drone_flight_log_book.pdfIn PDF document text
    • http://biomaniix.website/67467323297dj4d0.pdfIn PDF document text
    • http://wevotimojek.22web.org/lenovo_thinkpad_t430_factory_restore.pdfIn PDF document text
    • https://juzumefewuw.weebly.com/uploads/1/3/4/7/134766708/nunafojor-filiropewem-kukawafon.pdfIn PDF document text
    • http://woodbonus.net/40607076475pssxr.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/ChiicxB/verb_exercises_for_class_6_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/mgjsKif/ditanelofifujimomom.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/hdgizhf/18789324704.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/3Yz8dhd/benedetta_bruzziches_instagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bijaxufima.epizy.com/ice_fishing_report_chautauqua_lake.pdfIn PDF document text
    • http://donekik.rf.gd/lutuku.pdfIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_a52d89fea6284a378d8f2db072ce6c5d.pdf?index=trueIn 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_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 5280 bytes
SHA-256: 27baade45dc12777e25512d76e8751abf990751c0f02296cf5f40974329e4303
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10976 bytes
SHA-256: 76edfab009274f206c1d149a60809651af14d32efa80391832d9bf3f63ef3de9

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