Malicious PDF — malware analysis report

Static analysis result for SHA-256 10820226e3b8b40f…

MALICIOUS

PDF

82.3 KB Created: 2021-03-02 13:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ae861e9ea5d296244a13008e4e577c9c SHA-1: eeee427d0d44c0d5a9eae158b4af0c60594e0b11 SHA-256: 10820226e3b8b40f27ac7560b1705ba2ed54aa1a10a1766726a1870a51d27b14
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to harmful content.

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://jottigo.ru/strik?utm_term=thetford+toilet+service+kit PDF link annotation
    • http://jofufunobek.sportsontheweb.net/zunivirupigunakeji.pdfIn PDF document text
    • https://filududo.weebly.com/uploads/1/3/5/3/135390237/xupepopanuxezeg_tetete_gibiwe.pdfIn PDF document text
    • https://mexulurobe.weebly.com/uploads/1/3/6/0/136057308/362236.pdfIn PDF document text
    • http://genusttwsr.fun/the_way_of_the_psychonautj7liy.pdfIn PDF document text
    • http://getcabinets.xyz/books_about_life_lessons_for_young_adults9y1ad.pdfIn PDF document text
    • http://webpost.pro/how_to_calculate_theoretical_flow_time9vlvn.pdfIn PDF document text
    • http://smcjd.com/52894059003yxduy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_602dcfc8500db.pdfIn PDF document text
    • http://lidlid.xyz/74014914786f7u2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_60340f881f053.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/tumatavugujaxubimexi.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/2941602.pdfIn PDF document text
    • http://sebezedamewem.iblogger.org/does_matcha_have_more_calories_than_coffee.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/how_to_use_an_arc_trainer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_603ce54da1c49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/dillon_650_toolhead_stand.pdfIn PDF document text
    • http://namavorudil.epizy.com/lux_aeterna_sheet_music.pdfIn PDF document text
    • http://firiwigisu.atwebpages.com/gokawijigupojilav.pdfIn PDF document text
    • http://potimafekun.epizy.com/handwriting_ascenders_and_descenders_worksheet.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_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 4972 bytes
SHA-256: c8c4f0fadadf8fd307243cb6ffa5f19079193ba219bf952082df55175534d891
font_01_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 10928 bytes
SHA-256: 4cd1ef0ef4e0ca56416e1c48403363a2d8b7173b6de57fc0422c850b5d4a8727

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