Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3f7d24dd176f2…

MALICIOUS

PDF

81.1 KB Created: 2021-02-15 19:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0c3394c7979ac9e1bd4d9de667a979a2 SHA-1: ad8e14de4a85cd7396b9042027ecc9a233b7a715 SHA-256: 5af3f7d24dd176f28c7f53728c747b8bbfac8c1e759ac8417f2fbcc55d0adfe1
126 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 of which point to other PDF documents hosted on disposable or suspicious domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malware. While no scripts were directly extracted, the ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs suggests a potential for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/strik?utm_term=how+to+start+yamaha+moto+4 PDF link annotation
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/3883175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_601cb480ebdac.pdfIn PDF document text
    • http://givepamodugag.22web.org/momukijixogarifobabijalid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_5fda42e69c060.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fc842545df02.pdfIn PDF document text
    • http://puwonasomoso.22web.org/luzaxewexevigetojeweli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366047/normal_5ffb7e4768a69.pdfIn PDF document text
    • https://zasubimivari.weebly.com/uploads/1/3/1/3/131383839/vonodipiduropidipota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_601ddf4761bb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_601e808a41937.pdfIn PDF document text
    • http://xupelomepole.22web.org/756799035.pdfIn PDF document text
    • https://tematurulabi.weebly.com/uploads/1/3/1/6/131606540/b0e3ecb0455844.pdfIn PDF document text
    • http://nawumamarupojo.22web.org/93724369873.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/memexelu/43945878379.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/cash_flow_forecast_template_australia.pdfIn PDF document text
    • http://nufewusuk.rf.gd/sweater_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/android_studio_avd_manager.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_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 5136 bytes
SHA-256: c64e9de5a83ee8c6cdc3639ae5af39e565ff2372711d7736a811b0a23352af53
font_01_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 10948 bytes
SHA-256: 97971520fa16d5282539fd66d4d5edefa2ea8a8aef1df5f59d332a1e06ac8b1c

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