Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c19ea8af9b2f14…

MALICIOUS

PDF

70.3 KB Created: 2021-02-27 06:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c092646b7c6e4b9f587469a90ba324d9 SHA-1: 56ba3e687ad9aae4a9064f94f713a68c3fbda67b SHA-256: 89c19ea8af9b2f142efe4caef5bfce59480de03fd933c6a38a9673d8141c4e17
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to financial declarations, aiming to trick users into clicking malicious links. The presence of external URIs and the link farm heuristic indicate a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jacksth.ru/123?utm_term=formato+declaracion+de+bienes+y+rentas+persona+natural+sigep PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476925/normal_60303e514c529.pdfIn PDF document text
    • http://tdsevsvet.ru/mechanical_pe_exam_study_bookojuc3.pdfIn PDF document text
    • http://gulakami.22web.org/free_commercial_lease_agreement_template_nsw.pdfIn PDF document text
    • https://xipejefokodidub.weebly.com/uploads/1/3/4/6/134612454/3979449.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/57533126469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_60380742621e8.pdfIn PDF document text
    • http://zuxegesa.iblogger.org/human_anatomy_atlas_2020_free_ios.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/problemas_sociales_en_mexico_conclusion.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/pugebuge.pdfIn PDF document text
    • http://yellownatural.space/best_chest_strap_heart_rate_monitor_for_cyclingnlcmv.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/animal_cell_organelles_and_their_functionsuecz7.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/wolejofoxotaturujukajore.pdfIn PDF document text
    • http://repaircreditscore.info/62964817225v28pt.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/penadaku.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/migotononopotekidisu.pdfIn PDF document text
    • http://clobuss.ru/baxewosuzasasuz1pkl9.pdfIn PDF document text
    • http://immorta-cross1.club/befokerawekusabopvogn.pdfIn PDF document text
    • http://7lessons.website/kenmore_he2_plus_drain_pump_part_numberinmr7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujixedigegogup.epizy.com/agents_of_socialization_family.pdfIn PDF document text
    • http://wozowopug.rf.gd/tixifetifuzetesapajunazer.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_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 5588 bytes
SHA-256: ddff425fd4573da925a1b7a296947ccad08a86a291156cd8a7b01d1ccb65e0d0
font_01_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 11416 bytes
SHA-256: bf1c8e6040867c26671b4b2b888de0da342cb8c764e685420942448bc64ea086

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