Malicious PDF — malware analysis report

Static analysis result for SHA-256 546029c822b1726d…

MALICIOUS

PDF

77.7 KB Created: 2021-05-18 12:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7032dca5af7d5aeb443cbea80bb7051 SHA-1: 76d6cbfd37729d8829fc67e34082ee031c42123a SHA-256: 546029c822b1726d71b6bd0a4e8a55920c4873c2a9fe9d6b0065b3e7c54f8c32
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=zainab+al+ghazali+books+pdf
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/kuxakojolujotipo.pdf
    • http://vurenosul.22web.org/amman_devotional_songs_masstamilan.pdf
    • https://rojaduvesasesa.weebly.com/uploads/1/3/4/7/134751848/juginidubapitovopuz.pdf
    • http://xudogiborijum.66ghz.com/materiales_organicos_para_construccion.pdf
    • http://nadakudege.iblogger.org/new_cutting_edge_intermediate_workbook.pdf
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/pepogavuku-jonuratukez-wavup.pdf
    • https://duzesoduvumasu.weebly.com/uploads/1/3/4/1/134131570/8567183.pdf
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/07eb2d22.pdf
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/3064294.pdf
    • https://tupimala.weebly.com/uploads/1/3/4/9/134904604/7584290.pdf
    • https://zewelujipe.weebly.com/uploads/1/3/4/8/134846298/wivebebilese.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rojavaluji.rf.gd/cmake_tutorial_deutsch.pdf
    • http://binasizula.rf.gd/88159635956.pdf
    • https://uploads.strikinglycdn.com/files/a94b7094-9ff2-4e10-9ecf-1b0f2812dad4/42061434250.pdf
    • http://lezipador.epizy.com/carcinoma_epidermoide_de_piel.pdf
    • http://pexulimawuz.epizy.com/dupajizulefevedelivux.pdf
    • https://uploads.strikinglycdn.com/files/db45b581-4eb9-4285-a9ab-4a998a06d459/what_are_the_5_steps_in_the_engineering_design_process.pdf
    • https://s3.amazonaws.com/gazijewevan/97031174256.pdf
    • http://nalasorujuwasop.rf.gd/dedoburugipuku.pdf
    • https://s3.amazonaws.com/fadadedezeker/pabepeludajokavisibewuli.pdf
    • https://s3.amazonaws.com/jifedefujodu/13439896938.pdf
    • http://jovigoxuja.epizy.com/4146445615.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef93.bin
284341678efc3103dca94e202cb6cca5c30fd77505a877bbd54eb89f49425b00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 5416 bytes
font_01_sfnt_off00010202.bin
809f2a83d57dc6d50324a8d827fb063ab9535159160238bbc8712da8a7cf0ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 11564 bytes

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