Malicious PDF — malware analysis report

Static analysis result for SHA-256 1120a41171a76426…

MALICIOUS

PDF

78.6 KB Created: 2021-03-01 01:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 767c31ae5e934fa2bbd6e23d00936f46 SHA-1: 6264429dae0ad7b83b8f9582f31755046c4ee063 SHA-256: 1120a41171a76426df6374fd92b80db7a55e286efadb5ccd604fa4edbe2a3708
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 ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wb?keyword=optics%20hecht%205th%20edition%20solutions%20pdf PDF link annotation
    • http://kozidozilujivox.getenjoyment.net/28395870030.pdfIn PDF document text
    • https://bunafigokakataw.weebly.com/uploads/1/3/0/9/130969192/lejosupaso-xobizilidugi-binutopubez.pdfIn PDF document text
    • http://pefujogori.iblogger.org/gedisitokujowuz.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/3QMChho/red_ball_3_gameplay.pdfIn PDF document text
    • http://taxurofetizi.22web.org/riparian_zone_management_guidelines_tp148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416664/normal_600239b784b3d.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/bixejomopifuzezatoxuri.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/jdhgijZ/bus_simulator_free_download_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473031/normal_5ff6684d47246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_603092882a49e.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/51368713913.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/dgcfij0/color_switch_ios_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogosugo.onlinewebshop.net/zibigeb.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/garefexe.pdfIn PDF document text
    • http://kutoduno.rf.gd/32361773808.pdfIn PDF document text
    • http://paveviv.rf.gd/definition_of_anticipation_guide.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_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 5088 bytes
SHA-256: 5dabb322da9e60fa6c77285a6bae13a55c92d8d155a41a96f403e54f4740df3e
font_01_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 11996 bytes
SHA-256: f7cca5a402f18a8e1da65196d44ee57f07a43008208f1df067fee6cafd4574d4

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