Malicious PDF — malware analysis report

Static analysis result for SHA-256 13730e322fb62237…

MALICIOUS

PDF

68.3 KB Created: 2021-02-12 01:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0502cd8e28a827e170a3e33360d398cb SHA-1: b41ef7caa037393aa5f9f01e878c21a98cbb3bf3 SHA-256: 13730e322fb622379577dc4f83db7bd7c981d008bc6b8c23bcd44805b7ff24f5
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely used for initial access via spearphishing.

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://seumenha.ru/wb?keyword=visual%20identity%20template%20ai PDF link annotation
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/pifeziwuxigunu.pdfIn PDF document text
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/kesuvabelumiwo.pdfIn PDF document text
    • https://momukilogavar.weebly.com/uploads/1/3/1/4/131437465/5211031.pdfIn PDF document text
    • https://jubolovewo.weebly.com/uploads/1/3/1/4/131453214/4547867.pdfIn PDF document text
    • https://maxazokal.weebly.com/uploads/1/3/1/6/131606281/nefoxexujijepi.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/bewixivula.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/heCXihc/funny_facts_about_mental_disorder.pdfIn PDF document text
    • https://fijogukovope.weebly.com/uploads/1/3/1/3/131379832/wifegeridavim_kupefopa.pdfIn PDF document text
    • https://wobubowez.weebly.com/uploads/1/3/4/7/134709338/26e15bfa7.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/hfdpjcy/road_trip_planner_australia_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_602492e43b3a5.pdfIn PDF document text
    • https://cdn.sqhk.co/wafixagi/SRtREoM/49372642096.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/nazemi-kobejafikitami-fesadafokimimas-govuvitilu.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/0rgjpha/48063919763.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/gYiin4r/new_treatments_for_inclusion_body_myositis.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/kezipobogum-feren.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/chiDjb9/minecraft_survival_island_seeds_june_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA2 5076 bytes
SHA-256: 8c353dae4f4725c3aa8f20ae18953ab626592e345d1fc3b8cf8ad3afa08ce9bd
font_01_sfnt_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 10308 bytes
SHA-256: c987025058dbeb696f19b0f37f25e0a545a832e5ed9d42c0e24714b7049d87ac

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