Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a77c593ea55319…

MALICIOUS

PDF

75.4 KB Created: 2021-06-09 05:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e17730858091736710b526468392aebe SHA-1: 44c97427f23dc49e7972012a75d07f321e864404 SHA-256: 84a77c593ea5531902f57a178a53bd0fd8b7305311654bab289413495068b5f7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a large number of external links, characteristic of a link farm or SEO manipulation, with one URL pointing to a phishing-related domain. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://medvor.ru/pbw?utm_term=watch+a+cinderella+christmas+online+free PDF link annotation
    • https://mitapesazo.weebly.com/uploads/1/3/4/6/134652839/388910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417129/normal_604a92e64f3f9.pdfIn PDF document text
    • https://gituwelogasof.weebly.com/uploads/1/3/2/8/132814340/memexer_nelorotezamake.pdfIn PDF document text
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/padipabanifaxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_60bc6eab3e337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144542682/kufev.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/75587562397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1845eed-3074-4aa9-9607-74a5f2ead15d/62654531776.pdfIn PDF document text
    • http://giribuv.pbworks.com/w/file/fetch/144608277/75342577208.pdfIn PDF document text
    • http://rizukokodi.pbworks.com/w/file/fetch/144911703/56346710250.pdfIn PDF document text
    • http://serukula.pbworks.com/f/55619654384.pdfIn PDF document text
    • http://vowetegaperi.pbworks.com/w/file/fetch/144893850/58964910283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a75bc48-abab-45dd-ae7e-64cb4edd23f3/walmart_store_hours_near_me_today.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/gamofevijuguwakepavemevew.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144900171/72466276148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/513bb58c-29e1-4c52-9f83-eb735cb5c2aa/gulezepibumujijewaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4e79af-7837-4a77-b306-50e78b210a77/warhammer_40k_space_marine_codex_9th.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa5d863-7672-4fa6-9b7c-946a1160b532/the_daniel_plan_10_day_detox_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428751c1-13a5-4f84-8ac3-7c8da8dd9c2f/67529435183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a1fe8e-86ae-40e1-aa82-7eb7bfb6068c/escala_salarial_policia_federal_2020.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_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 5272 bytes
SHA-256: 601be183a125f531eeaced4d8a4da728d60521c7e90a085000f33c74dc077e49
font_01_sfnt_off0000f84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 11660 bytes
SHA-256: bd729c44abc61dbeee9d3cd23453ca375299f06004d9298feb6fa62840f3dc28