Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85ea97f058be83b…

MALICIOUS

PDF

94.1 KB Created: 2021-03-02 03:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6b7f05b55cbcfc38b52ec2073b7ef3cd SHA-1: 9aed595c41297505bd68523ee2af55f08cd93a9b SHA-256: a85ea97f058be83b43172cd8cd0c5ef22d847e8ea17921c672b9ae47b4f875cb
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious workflow aimed at tricking the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=demigods+and+magicians+pdf+google+docs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416331/normal_603b434c12fc1.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/vOghGhg/zedge_ringtones_latest_instrumental.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/xifemukivexenujufusasemoj.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/edipo_rey_resumen_completo_por_capitulos.pdfIn PDF document text
    • http://roboludawu.mywebcommunity.org/tevulazabagulemobavem.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/hyiiige/madazawibawojilibitij.pdfIn PDF document text
    • http://konujojijitezu.iblogger.org/articles_worksheet_for_grade_10.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/how_to_do_a_bubble_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_6023c87a48587.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/lefevexipojazojo.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/verizon_ont_i-211m-l_power_supply.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/what_are_habits_of_mind.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotodeperev.rf.gd/chrono_trigger_ds_100_walkthrough.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/23640338399.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_off00013086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13086 5376 bytes
SHA-256: 061d14001a91f34a294286a7858ea7bd740af082845916a82b0148dd5e75ea93
font_01_sfnt_off000142d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D1 11784 bytes
SHA-256: a541c5f8d2b535bdeb810fc27548decf3ea20c9e1f27c33a2db4b4087b310be6

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