Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6934c66b7286f83…

MALICIOUS

PDF

77.7 KB Created: 2021-05-11 08:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: af349e1e03620e398115997551efb062 SHA-1: 2c7b8f9ed17ab6005f3aac2b8af82063f46d8553 SHA-256: b6934c66b7286f8384c8c234d7fbfc4155e1702532bb26f973336edce9304f95
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=where+to+buy+cheap+ribbon PDF link annotation
    • http://tokiridevifo.medianewsonline.com/96975685427.pdfIn PDF document text
    • http://ruszaimclub.ru/white_rodgers_thermostat_no_batteryswoqp.pdfIn PDF document text
    • https://ruvezidarumova.weebly.com/uploads/1/3/1/3/131380493/gazalotu.pdfIn PDF document text
    • http://clipshd.design/b_s_recorder_13wb62e.pdfIn PDF document text
    • https://gerapulopenun.weebly.com/uploads/1/3/4/5/134587141/kajuzilivofasogokila.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/revuxosulawebet.pdfIn PDF document text
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/6746948.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/nogoxolunusunuginegos.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/adjective_worksheets_middle_school.pdfIn PDF document text
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/8874720.pdfIn PDF document text
    • http://jewigekavevexi.22web.org/17949464861.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/pudivefer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebusepuwiri.atwebpages.com/kiwovarumazawanaridosaje.pdfIn PDF document text
    • http://pexivakerofus.rf.gd/21084942142.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/1630560763.pdfIn PDF document text
    • http://ximuxulizi.myartsonline.com/75134350639.pdfIn PDF document text
    • http://zudozam.epizy.com/clash_of_clans_mod_hack_ios.pdfIn PDF document text
    • http://pusobif.rf.gd/22832379891.pdfIn PDF document text
    • http://momejawepafad.epizy.com/the_bronze_horseman_poem.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_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 5064 bytes
SHA-256: 1444b1e0090aa899b55389ac7bd4bf2cd5f5018f6ec76edaae046599f204c22e
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 11428 bytes
SHA-256: 2548a86a9677c7d8392b78342644cc7ddaac7ac611896a6280de2422b2485be6

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