Malicious PDF — malware analysis report

Static analysis result for SHA-256 25983ddb038799ac…

MALICIOUS

PDF

116.1 KB Created: 2021-05-02 16:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c8299e2ab487f1b585814a0797b3bc22 SHA-1: cf05dac606dbe3bcc5075782efed474e2f321f5e SHA-256: 25983ddb038799ac59c4983735ff7da0074a8d7c2a62c2a8402c8db9a387478a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though truncated, mentions 'Coursera html css and javascript assignment solutions', serving as a lure to attract users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=coursera+html+css+and+javascript+assignment+solutions PDF link annotation
    • https://cdn.sqhk.co/wujamufaw/cfiau5U/80714206906.pdfIn PDF document text
    • http://wepopoxuzune.22web.org/11256303338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388416/normal_5fe0042589aec.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwebobit/hSnhjgf/vova_app_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/75ege2v/xakip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384839/normal_5fe40ac7f2dfd.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/Qicigif/bluffton_weather_forecast_hourly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389074/normal_5fc908f354767.pdfIn PDF document text
    • http://kebuwakuje.medianewsonline.com/effortless_mastery_kenny_werner_download.pdfIn PDF document text
    • http://metagopu.22web.org/79455935574.pdfIn PDF document text
    • http://femusawar.iblogger.org/lenogos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_6010a6b3dced0.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/icJggji/40204101326.pdfIn PDF document text
    • https://dimafivatoputir.weebly.com/uploads/1/3/4/4/134496040/kujadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_600b15ee02c11.pdfIn PDF document text
    • http://gigojosok.22web.org/84028916399.pdfIn PDF document text
    • https://kelukija.weebly.com/uploads/1/3/4/3/134337818/ebeda3f77f48.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/volume_of_cone_and_cylinder_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000168e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E6 3360 bytes
SHA-256: 9ea92043687f4c538559a504344ddb816beab214277b877cf435e327c429a5f3
font_01_sfnt_off000174e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E6 5528 bytes
SHA-256: 2a0041d08f2d93ee9b51b03833ce76689a718f634b0bcc88558250406cd7ece7
font_02_sfnt_off00018786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18786 2656 bytes
SHA-256: c5031a7bdd21dfbdd0ec2c2d45801a455219b463106eb353dd8d87da423b7317
font_03_sfnt_off0001930b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1930B 14492 bytes
SHA-256: 90f887fa9a6e4afb5f8e7315c2c4bc8e4ae65899b825527ff3dd0b18487af724

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