Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dda9baaf14e3690…

MALICIOUS

PDF

78.8 KB Created: 2021-05-12 01:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a4380b6fba7f1c06952fb31d8bec4fa SHA-1: e6cf240e37e6e1e0647de32e8a43521140ebcdbf SHA-256: 1dda9baaf14e36903ed1646539f5fa4a2f643220593f6cdae7d1133426706828
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and one specifically linked to a lure about treating a nose zit. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+to+treat+a+zit+inside+your+nose
    • http://pojesuwemi.iblogger.org/harare_weather_report_today.pdf
    • http://fufejezonodim.mywebcommunity.org/curriculum_vitae_formato_para_rellenar_gratis.pdf
    • http://nosixavol.sportsontheweb.net/37536511365.pdf
    • http://fadopaduwovod.iblogger.org/74734192128.pdf
    • http://rupazaduxil.mywebcommunity.org/dialectical_behavior_therapy_overview.pdf
    • http://lalevuw.mypressonline.com/rumemutudekukowipes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bugenerefajujus.atwebpages.com/circuite_integrate_analogice.pdf
    • http://xovolefewawex.atwebpages.com/what_are_the_stages_of_a_healthy_relationship.pdf
    • http://nuzikenevizut.onlinewebshop.net/15029062878.pdf
    • https://uploads.strikinglycdn.com/files/21f31759-c022-41c5-91ff-43d9f66742fa/how_to_replace_battery_taylor_thermometer.pdf
    • http://lumosaneja.onlinewebshop.net/7307504931.pdf
    • http://kadegezopofog.rf.gd/xupudizelosebibateke.pdf
    • https://uploads.strikinglycdn.com/files/5b01d7a1-3b1a-42d8-a0ea-5bf5c37b19d0/8876746110.pdf
    • http://metuvubom.rf.gd/58346798848.pdf
    • http://vanepozimor.rf.gd/kannada_sad_feeling_songs_free.pdf
    • http://kosezofejesuxef.atwebpages.com/what_is_bcm_ar_15.pdf
    • http://kavejanunar.epizy.com/11870816812.pdf
    • http://rosajeku.myartsonline.com/principles_of_public_health_nutrition.pdf
    • http://xifeloj.onlinewebshop.net/70301321429.pdf
    • http://zibelasavu.atwebpages.com/asturias_guitarra_clasica.pdf
    • https://uploads.strikinglycdn.com/files/6eb97d7b-8f72-485b-924d-b565ba8f65b6/john_deere_d140_parts_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab6.bin
6b3d9c40c4ed0ded22d3fe00a9a8222e1b233d67928aa7c8217418196ea6a43b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 4876 bytes
font_01_sfnt_off0000fb65.bin
adc8aa3127f026dc8390b835077f40a25e416554fd7ff7bdf9deff170a168f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 10624 bytes
font_02_sfnt_off00011f76.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 4324 bytes

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