Malicious PDF — malware analysis report

Static analysis result for SHA-256 4729f0f103008d59…

MALICIOUS

PDF

76.7 KB Created: 2021-01-08 02:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2b19fd9bd666efb49c82ad051b2e86c SHA-1: c3aa55dcfdac20ce4b6fdf3bd91549e4a0654142 SHA-256: 4729f0f103008d599ed335c995ac20707aef99a12cf5536009f9c180c07c5b91
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to various domains, many of which are hosted on disposable or link-farm-like services. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not legitimate content but rather a mechanism to distribute malicious links or redirect users to phishing sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=vizio+model+xvt553sv+manual
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/vevevoxonudariku.pdf
    • https://static.s123-cdn-static.com/uploads/4366359/normal_5fc53a29bae94.pdf
    • https://cdn.sqhk.co/doxurozupu/Whejfgd/best_piano_songs_2020_mp3_download.pdf
    • https://cdn-cms.f-static.net/uploads/4481516/normal_5fad89c33b741.pdf
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/biwolu.pdf
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f9b05ab8cac3.pdf
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/696631.pdf
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5fb8bbf4dba2d.pdf
    • https://povuwifapijolak.weebly.com/uploads/1/3/4/2/134265363/sakowegebazozaxi.pdf
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/tireluvosalerovuj.pdf
    • https://cdn-cms.f-static.net/uploads/4495843/normal_5fd63c966520e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5a0ce32c-d092-410c-a4a8-2ff7b9b135f3/sesaduxarilaze.pdf
    • https://uploads.strikinglycdn.com/files/933c6144-81ac-481a-89c1-0250bd4f4687/jexawixaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e245.bin
63a7b2a38a583a6f4018a6f1f787278bcd2aa8cb006439aa694ac150a2edb503
pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 5188 bytes
font_01_sfnt_off0000f3eb.bin
8e86606e7756d8b150aae64a81afb23ebe72c9088436071ba3695f2600a9cddd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10540 bytes
font_02_sfnt_off00011809.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 4324 bytes