Malicious PDF — malware analysis report

Static analysis result for SHA-256 d374b6fab61dc57e…

MALICIOUS

PDF

77.5 KB Created: 2021-03-07 11:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb11adeb1a44ee62e73abcb22196f37e SHA-1: ade9b4045fa92cd910b8b9a7de5d51f55ce859ec SHA-256: d374b6fab61dc57e20f1d86e49e128f29b98dc4356a96893ad83453ec2fce2e8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests the document attempts to trick the user into running a command, likely to download and execute a second-stage payload from a URL such as https://dafemum.ru/wb?keyword=swann%20dvr8-4580v%20hard%20reset. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic further supports the idea of a multi-stage attack where the user is prompted for a password, potentially to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/wb?keyword=swann%20dvr8-4580v%20hard%20reset
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fd34d2322b55.pdf
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5ff7e7e3e7e5d.pdf
    • https://static.s123-cdn-static.com/uploads/4485943/normal_6004c04e67b66.pdf
    • http://ragikoxake.22web.org/96995422425.pdf
    • http://faxixovojaja.sportsontheweb.net/bedemefabepafadat.pdf
    • https://cdn-cms.f-static.net/uploads/4463529/normal_601bcda49d20f.pdf
    • http://pakupuxojopef.getenjoyment.net/87576683750.pdf
    • https://cdn-cms.f-static.net/uploads/4389101/normal_600ace2ec7b4c.pdf
    • http://dakijexok.22web.org/49151053002.pdf
    • http://dosijefa.mypressonline.com/pibowabi.pdf
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5fcb6ee5d560b.pdf
    • https://cdn-cms.f-static.net/uploads/4403260/normal_601e8c863a6fc.pdf
    • https://cdn-cms.f-static.net/uploads/4448547/normal_600bf025295fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wobanunep.myartsonline.com/aci_detailing_manual_free.pdf
    • http://petojijoxura.onlinewebshop.net/why_do_karst_topography_only_exist_in_some_geographic_locations.pdf
    • http://nufularo.epizy.com/how_to_be_the_best_pr.pdf
    • http://tipokeviti.atwebpages.com/22913778207.pdf
    • http://mitufesidu.epizy.com/irrational_thinking.pdf
    • http://bifovigavij.myartsonline.com/minikib.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_off0000df5a.bin
2d5524fefca6cf159028b9fd07527148adb81e3060741e15fcd3bad3964b71b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 5348 bytes
font_01_sfnt_off0000f185.bin
3b193eda28c7cbd532fc8e47666e3317c13d660f212ae5ebf4e7f9dfdb76aa21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 12096 bytes
font_02_sfnt_off00011906.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 4324 bytes

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