Malicious PDF — malware analysis report

Static analysis result for SHA-256 7499691bac45cd2e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-21 10:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d64f43b61dde88bc418ef6f7474240c SHA-1: 96670a0eb7c876d441a9aa929855b2a78833f8e0 SHA-256: 7499691bac45cd2e3757cd1a22d775c9c8f72089eafc5ab7d7f2da12b02b6d7c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=explain+what+are+the+basic+logic+elements
    • https://cdn.sqhk.co/binebelezux/cvgfJhc/78722777007.pdf
    • http://bitunowaluf.sportsontheweb.net/bhartiya_samvidhan_book_download.pdf
    • http://vikiduxa.mywebcommunity.org/xosariwemirinoxixafoz.pdf
    • http://kakolamilasaru.medianewsonline.com/dunabuwijoxikexuwozo.pdf
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5fee52532818c.pdf
    • http://tewazezila.66ghz.com/how_to_copy_words_on_instagram.pdf
    • https://cdn.sqhk.co/mofosalamo/cjcKie5/15701576398.pdf
    • https://cdn.sqhk.co/fuludasowipu/hNogh0R/17673029432.pdf
    • http://difanogoz.22web.org/land_reform_policy.pdf
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5fc968123edf4.pdf
    • https://cdn.sqhk.co/jivazufevi/jijehcb/47951879529.pdf
    • https://cdn-cms.f-static.net/uploads/4502236/normal_600caebf88467.pdf
    • http://povegoj.22web.org/sherwood_rx-4109_user_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4481684/normal_604972e57f1f0.pdf
    • http://wixiziz.iblogger.org/netflix_laptop_app.pdf
    • http://solusaxisabo.scienceontheweb.net/12497867739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://goxogibote.rf.gd/zilarabuwekobigikibi.pdf
    • http://watusatuvor.myartsonline.com/90647034767.pdf
    • http://nopasemetefut.epizy.com/golelemipubagefopaf.pdf
    • http://fategag.rf.gd/76473291762.pdf
    • http://nopawalaxuwaw.onlinewebshop.net/berserk_manga_download.pdf
    • http://furunes.onlinewebshop.net/23451006148.pdf
    • http://pezuxegoweniger.epizy.com/berako.pdf
    • http://natetakadax.epizy.com/mutilamumosofulul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08c.bin
6c66440f152743e121dd846265457005b6a38fe30e481f3e20d2a52a88329505		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 5604 bytes
font_01_sfnt_off00010386.bin
7167129a78d0a67289ca66a172a4f678c3535b247b9d6d6eee71c8b346c74174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 10776 bytes

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