Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd52b4d7e0cfbc28…

MALICIOUS

PDF

116.2 KB Created: 2021-05-14 23:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d0206ab33d13ddf4403105334d9b6c4 SHA-1: 0288021439c0a1d444983f4d3cff411181167ebb SHA-256: fd52b4d7e0cfbc28a1d51468ad93ae637377da08ae0e3369a4451cf8821a5115
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=asp.net+tutorials+teacher PDF link annotation
    • http://wazasutosas.iblogger.org/37635876203.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/42288018956.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/built_with_science_intermediate_build.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujoxamafo.epizy.com/pewema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c5c4ca-bf92-4234-a253-335d17747a0a/regal_jumping_spider_diet.pdfIn PDF document text
    • http://wivowutone.epizy.com/61180549487.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_69903e161eeb4e38bb4dcc9f73f99a03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2773648-e9f8-49e6-bd9e-66e40d1f4f6c/is_audacity_safe_to_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863b6d63-7d04-4870-8850-8b9cb25b73ef/do_androids_dream_of_electric_sheep_chapter_14_summary.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/canon_canoscan_lide_110_scanner_driver.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_5c921c60387f4b8bab5f03abc32acc8a.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_bb34435c8321440588491d433bffaa7d.pdf?index=trueIn PDF document text
    • http://gavofime.atwebpages.com/riruwijatuzefibomazaj.pdfIn PDF document text
    • http://basefiwan.rf.gd/37560167370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4aa133-46df-474c-9ef2-239dc9297019/how_to_thread_pe800.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_52b7f683fc924b4d986d61f76b75afdc.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_abc425b0461240b6a825f0ab7d104b4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9970ec4-2e27-4a0c-aec3-854d843c0ebd/87953746359.pdfIn PDF document text
    • http://sibuxolubi.epizy.com/asme_section_ix_welding_and_brazing_qualifications.pdfIn PDF document text
    • http://zuzimekot.rf.gd/9708013055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d394ed-b507-4ab5-9b8e-dfc333836ede/jomomasexoxufewivikixatam.pdfIn PDF document text
    • http://tofarogupa.rf.gd/lakhimi_assamese_movie_free.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_off0001873b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873B 5044 bytes
SHA-256: 26e557a1d596b417190d1e87dca7ba6d74923755df1cd0435421b36197d4aafd
font_01_sfnt_off0001985e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1985E 12272 bytes
SHA-256: 9b7d0d5feb0db90dbf1090795c9b8ee109dd41ef1e4322305eb4dd6b81c352ce