Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae483677287c1f11…

MALICIOUS

PDF

76.8 KB Created: 2021-03-09 21:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f155c06bdbdce95843a5216ab607f58c SHA-1: 97eebd03daefca3f42acdf809d71e40557a0aaeb SHA-256: ae483677287c1f11238542576741c550a91419953905b457fe8ec67877c1d52d
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, with the primary URL being https://zajinet.ru/strik?utm_term=sv98ln+won%2527t+turn+on. The PDF structure suggests it's designed to act as a link farm, directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=sv98ln+won%2527t+turn+on
    • http://logoped-samara.ru/bunn_slush_machine_manualvoztx.pdf
    • http://catsism.com/47763985960sp52p.pdf
    • https://cdn-cms.f-static.net/uploads/4414153/normal_601911006c64a.pdf
    • https://cdn-cms.f-static.net/uploads/4448540/normal_60188ae4beb60.pdf
    • https://cdn.sqhk.co/pabelewexo/jhaaib0/ridur.pdf
    • https://cdn.sqhk.co/kajojetugap/Ljh9Pe5/toefl_exam_preparation_material.pdf
    • http://lnstagaram-verifiedbadges-from.com/kahoot_theme_sheet_music_clarinetlfob4.pdf
    • https://cdn.sqhk.co/jugomuzuteb/NxBhcgh/hornblower_cruises_dc.pdf
    • https://cdn-cms.f-static.net/uploads/4465539/normal_6037a23556f47.pdf
    • https://static.s123-cdn-static.com/uploads/4454056/normal_5fc5e8b33797d.pdf
    • https://static.s123-cdn-static.com/uploads/4369307/normal_5fce0ac5c45bf.pdf
    • https://cdn-cms.f-static.net/uploads/4474719/normal_60306580722c1.pdf
    • https://cdn-cms.f-static.net/uploads/4474218/normal_601656153f28d.pdf
    • http://fortysgjdk.fun/bufekewukawefubonijamusen5y30u.pdf
    • https://cdn.sqhk.co/kekelivig/3ha5ohe/48908082206.pdf
    • https://cdn-cms.f-static.net/uploads/4373985/normal_60337532c5e72.pdf
    • https://cdn.sqhk.co/vuranataxu/hfDQIZv/kilamifaxubipimasige.pdf
    • https://cdn-cms.f-static.net/uploads/4485698/normal_601d5eba3f007.pdf
    • https://cdn-cms.f-static.net/uploads/4393644/normal_600f733f35f10.pdf
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5fd746c3b8f64.pdf
    • https://static.s123-cdn-static.com/uploads/4383573/normal_5fe5c2e45ba20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_5d3f59e10bb24191b279ce164113e3b7.pdf?index=true
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_f0209e5afeaf426083a9d9474d43657b.pdf?index=true
    • 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_off0000eee9.bin
e2b7aa62470fb67eac80134f34819f262018f0e3175fa5d71bff5d6bf38fbacb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 4928 bytes
font_01_sfnt_off0000ffde.bin
3f50896140061270fc8bdadd88750e3e9889637836b4689199c66203f3f1c6cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 11468 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.