Malicious PDF — malware analysis report

Static analysis result for SHA-256 61631038bbffcea6…

MALICIOUS

PDF

76.8 KB Created: 2021-03-29 20:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c606604ad757b0b421757352fa9c7601 SHA-1: b45e50eb044564498628b01625eeeab43778b847 SHA-256: 61631038bbffcea6f7c7c3a3636f134ef7f8e0576f6b2144de3acff66d41c2cf
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the embedded URLs and the PDF structure itself are indicative of a malicious workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/award?keyword=cetose+dieta+pdf PDF link annotation
    • https://cdn.sqhk.co/xanuramalu/4Zz0Huf/jofadotipewaweborosob.pdfIn PDF document text
    • http://penageli.getenjoyment.net/analysis_of_algorithms_sedgewick.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_6025f42a8834e.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/iiifhhy/port_lympne_zoo_tickets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5fd8e8a834cad.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/Riihh9r/defender_2020_for_sale_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/LhgRjso/jebatinupo.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/vEiaAn9/minecraft_new_ore_ideas.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/mimumewir.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/is_all_rockwool_fireproof.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/biwovanenadixenimipemujil.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/ghihjjh/ice_cubes_freezer_burn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fcbcea710b33.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/VoieQic/diversity_and_inclusion_training_outline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_6015ada4c8ce7.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/XhaFoGf/4_pic_1_word_3_letters_ship.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_aae1abe851964c149a8290ec10ee478c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18b7d1f-68b8-4a25-8914-c35c922ff393/chemistry_live_workbook_solutions_chapter_15.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_806ea06903c942d28befb35fc1c74256.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_4c2c5381864b4599b274d3453180060a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6bcec9-226f-4b03-b40d-6e4ee0ff3c9f/innova_3120d_update.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_c59a385fec1f4505bf6ec33e4cffc346.pdf?index=trueIn PDF document text
    • http://jukasuxoseki.atwebpages.com/ratamukoxi.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_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 4812 bytes
SHA-256: 46a78b7dac4823aa9269120ac2b56521876b150a6144a16d7e3e3e57d3a06555
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 11380 bytes
SHA-256: 1fa6924faf72135ae36eccc46384d03bdbed1e619243e8e8cfb862f568b1bb2f

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