Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc374b1b8c33d89…

MALICIOUS

PDF

70.6 KB Created: 2021-03-05 11:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 31fcec94b9246dd0429b1a334d70ce1f SHA-1: 96bc4e6f37f96838e2471d971a9f3b5293e20ec8 SHA-256: fcc374b1b8c33d8937987cb29fae5531eeaf52a1466bcdeb172c7e23808541dd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly legitimate but ultimately disposable domains. The presence of external URIs suggests an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://nipisod.ru/strik?utm_term=how+to+clean+drum+unit+corona+wire+on+brother PDF link annotation
    • http://karnaval.host/fisadpvo94.pdfIn PDF document text
    • http://erethiztzj.space/dunabili3p6p3.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/are_the_sequels_worse_than_the_prequels.pdfIn PDF document text
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/7748746.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/8370907.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/sudowibimigamalejovukewu.pdfIn PDF document text
    • http://covidcapsule.world/60626490621tc7cc.pdfIn PDF document text
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/1187280.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/langston_hughes_birthday_poem.pdfIn PDF document text
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/2cddeae483.pdfIn PDF document text
    • http://8bitbeardsco.com/empire_tv_tycoon_downloadrs7en.pdfIn PDF document text
    • https://ronukava.weebly.com/uploads/1/3/4/8/134885886/7777854.pdfIn PDF document text
    • http://mp4.design/tivepipufoxugativexikek3jbs.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/storyboard_template_a4_portrait.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wolawatin/domonipuvug.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/agriculture_definitions.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/adobe_premiere_pro_price_one_time_purchase.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/xodenanafuloni.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/77054577626.pdfIn PDF document text
    • http://desazibali.epizy.com/46421220923.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/17455634079.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/getafe_vs_barcelona_0-_2.pdfIn PDF document text
    • http://surofavuvaxono.epizy.com/79324413378.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_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 5192 bytes
SHA-256: 90c7734769b407272766cd7fe293a49c8e71d52c1b8cdc8a3af139cbf4704f99
font_01_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10264 bytes
SHA-256: 0679943a3e7bea08fd8d061a498d898cda0bf68a0fb8eab101bbb52bf7c1accb

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