Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de35c1ab13798eb…

MALICIOUS

PDF

81.8 KB Created: 2021-05-15 04:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3994edf79bc9a4b7f4969b3bc304c548 SHA-1: ec7a392394d9f20838ebee62e3f5dfcd742c68c3 SHA-256: 3de35c1ab13798eb18cbe3542d90dc27d2b6deae4396534c98caa0d786e82954
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to a suspicious domain, suggesting a phishing or malicious content delivery attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into visiting a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=ai+machine+learning+salary PDF link annotation
    • https://cdn.sqhk.co/vefusujix/igihidM/niwidubovagasuwemesokizu.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/cgfTjha/nintendo_switch_online_games_list_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384316/normal_600298c251a16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_60121f35575db.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/jhifrgg/cadeira_gamer_mad_racer_v10_preto_madv10ptgl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446158/normal_5fe25664c2162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_600c9ae423079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc612f84388b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_6032f54d42a16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_60487f5d13c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_6031e11de2ca4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_caea4acddda643208acd1dacee5e9850.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_c1350b05e4ad46cfaa93e8676d842d6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5786afe-674c-40fa-a652-87f247794b17/8083115930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65be71ca-372f-49d4-9edf-b02cf169dfcd/90355922715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fee1d54-d005-4ad6-ae88-be63e79cf619/97895320672.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_cddd729eed7e42f79036cc6ed9757515.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_2e1db9977cfe4d72af95d075ed7ca79f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0c6967-cd05-4d16-8891-68a2eb14193b/what_is_sec_138_of_negotiable_instrument_act.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_904ec9e11e9f4c0099db38c06e586b6e.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_1066c7d3918243eaae974475789e2001.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_aba2403058c647539979516faa351f1f.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_832d00266e2645f49d8f4df65426b2aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e7e7d2-1a80-4ee3-a9a8-305bc5900e2d/why_wont_my_canon_printer_print_the_whole_page.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_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 5304 bytes
SHA-256: fecd7775a3cadc7182da7222cdcfe4d35055eb65f469d22267df3cc6c6d1efe5
font_01_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 11876 bytes
SHA-256: 625cc08d8a1d8882f97ebe0427c29688401297471a157b0042a215ef9dbf338e