Malicious PDF — malware analysis report

Static analysis result for SHA-256 091782d6c51c8ecd…

MALICIOUS

PDF

70.0 KB Created: 2021-02-15 12:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1395a15ac3e7e806aa1639f2320289ed SHA-1: 73cfb58d1394ec7ab67ef655eff910190dbfa3d7 SHA-256: 091782d6c51c8ecd52eb4549b549fca1512f158ca54c333b5043b08880334a3c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/strik?utm_term=line+6+pocket+pod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374374/normal_601a8ec5cf9cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380228/normal_5fccba0525295.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/ajgicja/85619360961.pdfIn PDF document text
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/tozezakoredisop.pdfIn PDF document text
    • http://mugafopame.iblogger.org/custom_bar_chart_in_android_example.pdfIn PDF document text
    • http://vafakewa.iblogger.org/93716819541.pdfIn PDF document text
    • https://nifevokore.weebly.com/uploads/1/3/1/4/131437532/3578923.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/1aa60a.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/hjnFHZa/birarez.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/XZwThdP/counter_strike_multiplayer_fps_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/jjjd6jf/29403432270.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/Oftieij/matamepokomumibadil.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/blMjggc/followers_and_unfollowers_app_for_iphone.pdfIn PDF document text
    • https://dituvilabo.weebly.com/uploads/1/3/4/8/134897320/1699705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekidezeze.epizy.com/tudirubinire.pdfIn PDF document text
    • http://xokutamewa.rf.gd/examples_of_electronically_stored_information_esi.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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 4708 bytes
SHA-256: 77fb2f0a3665c2be6e3527b74e23fb7ded2ea5c0c54aa094a6b08ac77f606d90
font_01_sfnt_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 10492 bytes
SHA-256: c452a77d0ca312da290cd3eb28d5e4c9736f99014e62adf5b9416037b21812d9

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