Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5ff8e83286018d…

MALICIOUS

PDF

72.8 KB Created: 2021-04-23 17:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 70b810eb7711ccd2897c7e44f93871ab SHA-1: 2025a6a80409317dbb7552ac1d2f90215f7bb738 SHA-256: bf5ff8e83286018d31463a79b6d7d7c90740e3254ef5e311a3170cf6678ea0b2
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including critical alerts for linking to known malicious redirectors and hosting a link farm. The document contains numerous embedded URLs pointing to various PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a phishing or malware distribution vector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=kafka+before+the+law In PDF document text
    • http://nuvagefo.medianewsonline.com/50286682543.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/iapOh47/60820469395.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/faa563e63.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/chfaibt/hammerite_metal_boya_renkleri.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/f0r6hAx/mugijujabisilij.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/iajcMRG/68381515610.pdfIn PDF document text
    • https://najatiruz.weebly.com/uploads/1/3/0/7/130738831/nomavorita-pigosilasug-jimatelimozak-wotamafefi.pdfIn PDF document text
    • http://pimazisiperej.iblogger.org/guvowedomiketipi.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/93070120370.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/ge8gtl3/xumugixagikitopukaxakefak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tevakosubatom.epizy.com/elante_mall_guide_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b2d722-6621-4c6d-931d-22c957916610/63514593379.pdfIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/11348290699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d5aeb4-f2af-44a9-b2a5-8f47ac045f26/dutixavimidudureduro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad8f960-3b69-433a-a526-e3a593653f99/how_to_establish_residual_income.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111aad3e-cf1a-4b4a-8a2c-00c394d43c7d/the_scorch_trials_book_report.pdfIn PDF document text
    • http://rabelame.atwebpages.com/gojoxararukanogejuneli.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_a0f4ca6dc6a74715a40de097d04e8097.pdf?index=trueIn PDF document text
    • http://lanikudawojag.rf.gd/estimating_sum_and_difference_worksheets_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5dea50-e261-4155-babb-39a177185b00/1342145216.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_445546f2465d41b6b53dd88bebc4d835.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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 4944 bytes
SHA-256: a577a8de446747757afcfa866a7387560c49ab7cd1f7de5619e37e611ae3d268
font_01_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 11280 bytes
SHA-256: e98727b5f7200dd9c270fada2e6eb6737e8b7cd80676a7b1b81bed1c02c4af94