Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d036b058b1c171…

MALICIOUS

PDF

102.9 KB Created: 2021-03-05 16:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fdc10b88842f1b5f99192708a7fd3592 SHA-1: ab01333e8322e74b4f79074c0b894abb4b1d7668 SHA-256: 50d036b058b1c1713413c376fdcb24262bccf0b7a76b4b6f015a2a2f808895a3
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or redirection scheme. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ponafet.ru/strik?utm_term=jayco+hummingbird+owners+forum PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370278/normal_5fcac9897e636.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/iMfijjh/stack_cubes_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450641/normal_5fc95b57872c8.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/IhiJ8aR/instagram_appeal_block.pdfIn PDF document text
    • http://qlemelest.online/parupupadolenodisobemadatcroip.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/ihyfEjj/72528316624.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosinewok/jhhgjsI/the_travels_of_marco_polo_original_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5fc9d8b690588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495860/normal_5fcbaa79d1a6d.pdfIn PDF document text
    • http://doucheop.xyz/the_ruins_of_gorlan_audiobook4kxye.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/Cy2xieG/7670326564.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/hefBhdZ/gbox_mall_compras_x_interneta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_5fd95f2418129.pdfIn PDF document text
    • http://sodaapp.club/bemetorakapum4tvr.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/ihvjdPU/halloween_decorations_ideas.pdfIn PDF document text
    • http://50offstore.info/5730365210ei1p5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_60240b516a462.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/sJjb6BZ/8196405717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485821/normal_5fe84315997f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_0d1dd2b5c8724c0c87ce3354b0b6ab19.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_3f313926752f47e0b25ec8d334a41d2d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF7 5728 bytes
SHA-256: 940510a0492f26949a7e0b4ace44333d74aa7ce5a27450ad889cc34de7ab3ef0
font_01_sfnt_off00014e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5E 11696 bytes
SHA-256: 87c7ca6ce01846460baaf29ae5f38c1b219d7551b18f1dfd0179bc3dc3842e9d
font_02_sfnt_off0001764b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1764B 16392 bytes
SHA-256: 954f30c1cce2e3a00f07cb0ababb04bf86a3a3c34ed8da2fc782bdc014231390

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