Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd423805b5887f8…

MALICIOUS

PDF

72.3 KB Created: 2021-05-14 05:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fb8b4e971e27c3207cd3e9470985cf2f SHA-1: 9845e6808bacc1c01a458c698e83542945345bcc SHA-256: fbd423805b5887f8f8bf3936b8972286fccb3e9d05bed8516be8b348c59e8582
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting services, and one prominent link that appears to be a redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm designed to distribute malware. The document body text, while appearing innocuous, is likely a lure to encourage clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jumiwimov.ru/strik?utm_term=what+size+windshield+wipers+for+2015+nissan+sentra PDF link annotation
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/2408934.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/lufad.pdfIn PDF document text
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/muvaged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_6065aafe77d92.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/23095709670.pdfIn PDF document text
    • https://vebudizegegogog.weebly.com/uploads/1/3/1/3/131398423/miteburepuro.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/voguritosizogetoxalivogid.pdfIn PDF document text
    • http://clientesdkb.com/guloresasituvjh4z.pdfIn PDF document text
    • http://best-ital.fun/bose_901_series_vi_active_equalizer_service_manual3ux71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_606113db5ed2c.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/6002975.pdfIn PDF document text
    • http://card2card.live/panasonic_cordless_phone_service_center_in_ghaziabadtp067.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455387/normal_5ffde0fe30d45.pdfIn PDF document text
    • https://vonebofakakare.weebly.com/uploads/1/3/1/8/131856314/zopuvosugoji-mupezopukoj-luwigabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pezefaxovojole.atwebpages.com/vilirexi.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/24854240277.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_ce7a5ace96bc4adfb05ea0357d907f7d.pdf?index=trueIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_52eb1dd230e24a299ad2b287362bc5ac.pdf?index=trueIn PDF document text
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_d2d8a8e4683f41f4bc1c79cc0d6c928b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 5524 bytes
SHA-256: d6de74dab32e81caa1c690fb0ae0e501d10d8f6bfdd70b62a1a7d6add0274f53
font_01_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 10972 bytes
SHA-256: 255f9ccf300e73f4b7b223363a1bcf965ba836377db8db78cbf05d6912e631f0
font_02_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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