Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb651775bb89b256…

MALICIOUS

PDF

76.5 KB Created: 2021-04-17 23:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fd227f3bbcba893d692a743408fd6449 SHA-1: d9c5210dbcdfb681437c06849e170038900bd3cd SHA-256: cb651775bb89b256792f1160b97fa6a6ec354b492aa75f8f0a999059670b5d34
184 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a high number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm or phishing attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+database+management+system+in+dbms In PDF document text
    • http://walletelectrum.buzz/85543771123nmc78.pdfIn PDF document text
    • https://nasinapalu.weebly.com/uploads/1/3/0/7/130739684/rulasu.pdfIn PDF document text
    • http://xenemedoxasuv.22web.org/donald_barthelme_sixty_stories.pdfIn PDF document text
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/e3c55e453299.pdfIn PDF document text
    • http://hurleyshamburgers.com/72523917553sctbt.pdfIn PDF document text
    • http://xiguxivevov.sportsontheweb.net/24978115571.pdfIn PDF document text
    • http://glawerry.online/83497966669tm7re.pdfIn PDF document text
    • https://riwinuwozobama.weebly.com/uploads/1/3/4/8/134868589/6700770.pdfIn PDF document text
    • http://euromarket.pro/wupojeloxaligivoviwuvojemmbpo.pdfIn PDF document text
    • http://gifinibufenatar.medianewsonline.com/29955829662.pdfIn PDF document text
    • http://fixmarker.fun/tram_pararam_free_picswz7kc.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/17348250106.pdfIn PDF document text
    • http://gomunawuwox.22web.org/kindle_4th_generation_user_guide.pdfIn PDF document text
    • http://zakoroxani.22web.org/49779044770.pdfIn PDF document text
    • http://bigtittybella.com/cual_es_la_importancia_del_presupuesto_de_capitalcluk9.pdfIn PDF document text
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/0f3d43.pdfIn PDF document text
    • http://indital.fun/784720133dkwov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekawaxag.rf.gd/xusevadid.pdfIn PDF document text
    • http://nezeseg.epizy.com/the_towering_inferno_movie_online_free.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/pearson_college_algebra_and_trigonometry_4th_edition.pdfIn PDF document text
    • http://bikevobo.rf.gd/ziweraxuzufomibelodakobi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 5368 bytes
SHA-256: d31f5bfe45d83ce163685e921374309e130484c131ff52feb981ebcf985fa823
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 10432 bytes
SHA-256: ceef3e0c148ec833ffe850b9393df1b89f79d1add33bf71e92b4ba1c630f4b8b

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