Malicious PDF — malware analysis report

Static analysis result for SHA-256 446dec210608fe05…

MALICIOUS

PDF

75.5 KB Created: 2021-04-27 17:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c6067408efdac63861341b38d98a9265 SHA-1: e1323d90290738d20f71d87172f8c2023bfc3372 SHA-256: 446dec210608fe050ecf0750a4eb055ada8ec68dd31d8f71a8393783ebd88655
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=peaceful+easy+feeling+solo+guitar+lesson+youtube PDF link annotation
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/wovuzosawufefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481053/normal_60385c9b2ab3d.pdfIn PDF document text
    • https://latesadujogoxov.weebly.com/uploads/1/3/1/6/131607544/1102830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_6053e172812ee.pdfIn PDF document text
    • http://parirapopuj.22web.org/barron_s_sat_prep_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_604e273c11697.pdfIn PDF document text
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/982d34bce5598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_601324b2cd26c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459922/normal_5fefd5f11f9fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_5fe3e7bc84fc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sivanira/zavobuteze.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/sort_column_by_date_google_sheets.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/60500866242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1477a0-2af1-47c7-aa86-5c801cf06aa3/dimomegoli.pdfIn PDF document text
    • http://fasilew.epizy.com/anaconda_linux_install_guide.pdfIn PDF document text
    • http://xajokaxakubif.rf.gd/microbial_genetics_ebook.pdfIn PDF document text
    • http://bezakimodetores.rf.gd/28500157907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889cf19e-4009-4dc4-9dd9-9024616110da/how_to_loosen_a_kydex_knife_sheath.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_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 5292 bytes
SHA-256: 157b5724780ad33bd96f340fcba62ae9561a9a509442a46ee6a7509b0323a6c7
font_01_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 12580 bytes
SHA-256: f73b16564240433c708faea0f106b9a301042099dbf6fb8f558b777fa98a6395

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