Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9d4c33822f015d…

MALICIOUS

PDF

81.8 KB Created: 2021-04-02 18:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c2a27c5ba532db49e8c443508feb55bb SHA-1: e2e8a8056fc2faa4cc4e075443525afed8377e70 SHA-256: da9d4c33822f015d774f39df7765fd9ffd999de2fb495ad4ffb763fa654fb168
186 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily corrupted, indicates a lure for a free guitar course PDF, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=curso+de+guitarra+el%25C3%25A9ctrica+pdf+completo+gratis PDF link annotation
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/rogupefegateku_dewufeziweg_pupufu_giboxajozo.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/ge5iceQ/kitolenoxelolurasemovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_604ce2eed57ac.pdfIn PDF document text
    • https://bowasizavaxilek.weebly.com/uploads/1/3/4/0/134042597/f0bf2c30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_605a3e26510b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_601f0d02571fd.pdfIn PDF document text
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/6979110.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/gdotUjb/classroom_screen_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/H5fI9ia/82423316453.pdfIn PDF document text
    • https://cdn.sqhk.co/tamoravuwera/hghdHhi/frogger_golf_brush_canada.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/rizozovokabixa-lajera-kasow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_602a7a7e235db.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/gg3gcB5/html_code_editor_online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_0ac2c0af88ff4c09ad8c3c8321fd336f.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_a15b0df5a942493ca8f66e59badecf9d.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_54f213e1a8bc4a31b9cc93695e0c50ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/177c934e-fb76-48a4-8985-886671a4c6c4/dan_kennedy_magnetic_marketing_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d08550-4278-466a-ab0a-dd2672b5b105/air_force_1_shadow_sneaker_pink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d810d77-9814-4234-a787-c0e147ff61d3/how_to_wire_directv_satellite_dish.pdfIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_79fe2cd2483646d2a4d1ff46d74a0293.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8cf938-4ee3-4a47-972f-ea7af0b2216c/18163121782.pdfIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_a1bca9867d314352a9bc267f44bdbd3d.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_6fddb2e0683b4c4ea41d78db2c6925e9.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 5524 bytes
SHA-256: b1cc90863c278debe1ee504dbdf82ef11669724aeeffb4e9bf53abd548c458b2
font_01_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 12448 bytes
SHA-256: 1d8b7268a96c7f39deb5cca8d424dfd820f46c16a6ca7d8b5dc1a4181fcd5bd8

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