Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d995ee5ce8e6103…

MALICIOUS

PDF

78.1 KB Created: 2021-04-14 17:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 73d57d86ee54484263f4b2d42f1d5430 SHA-1: b93ea515bb8bc928111ff840c68435ce4b367ce9 SHA-256: 3d995ee5ce8e6103aa0b09e27ac902c6caafc107160124d4cc36ee8abebd4c0f
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 hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

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://dugedepap.ru/strik?utm_term=fujitsu+fi+6130+driver PDF link annotation
    • http://mastera-saydinga.ru/how_to_get_a_senior_drivers_license_ny8w3g6.pdfIn PDF document text
    • http://accueilcmb.com/3909021598028718.pdfIn PDF document text
    • http://salonhq.xyz/electronics_notes_in_hindibbd0n.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/73132451021.pdfIn PDF document text
    • http://starkrobotics.org/domilasawevasazumasajl761.pdfIn PDF document text
    • http://shoop-fm.ru/kozikifatejotixolivirojo2hy.pdfIn PDF document text
    • http://blankid.ru/nodiboterapedibe09vr.pdfIn PDF document text
    • http://heartcenteredequestrian.com/sumalaxozalakowozepun97yf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafolilujoxupan.rf.gd/bearing_types_and_application.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/84791441041.pdfIn PDF document text
    • http://xifuwezu.epizy.com/nidakurotegedemeguposagot.pdfIn PDF document text
    • http://febinobe.epizy.com/zelusejorunorukusiz.pdfIn PDF document text
    • http://moxozejoxolisuf.epizy.com/dadulabupikirazopi.pdfIn PDF document text
    • http://bopiguxa.atwebpages.com/best_alesis_drum_module.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/9168431883.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/getting_started_with_spring_framework_4th_edition_github.pdfIn PDF document text
    • http://sobumewupuvuve.epizy.com/sezenirotomexuwejufelav.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/20516544725.pdfIn PDF document text
    • http://gejofizax.rf.gd/vamewafobepaxaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/jadovidegelagawazowuwu.pdfIn PDF document text
    • http://lapodalojowev.rf.gd/58571576252.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_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 5264 bytes
SHA-256: 260cc123f189fea8b6ab0ebfb890c000cd9ca9619b79c26fb9fb7ef91c3961e4
font_01_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 11448 bytes
SHA-256: 3a135807994492cb0ed60b9d3825aae4f97b0ed42d6bd74b867be80f04d7b342

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