Malicious PDF — malware analysis report

Static analysis result for SHA-256 484a20f41ae79fa7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-14 19:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b47ac604da7da552cb3193cf95bda5d SHA-1: 79cf28e7c44e901b9876aee5fcd6526ea0847164 SHA-256: 484a20f41ae79fa733e6eff2daeb64caacc2510780ed4b387befd98964b56df6
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, some of which are part of a link farm, and references the 'rundll32.exe keymgr.dll krshowkeymgr remotely' command, suggesting an attempt to exploit system utilities. The presence of these elements indicates a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jumiwimov.ru/wix?keyword=rundll32.exe+keymgr.dll+krshowkeymgr+remotely
    • https://cdn.sqhk.co/sewuvavimebi/fvhejbf/20891252565.pdf
    • http://lifegirls.site/lasko_cyclone_fan_stopped_workingx7yro.pdf
    • https://cdn.sqhk.co/kapideto/igthbgc/kisotorenumetobadikifi.pdf
    • https://cdn.sqhk.co/rigizisojix/Hjr6hj2/47721315263.pdf
    • https://cdn.sqhk.co/gilubibawi/hgBghJ2/45538624506.pdf
    • http://procripton.com/zuxibanolusuzaxafobes42kqw.pdf
    • https://cdn.sqhk.co/ganinidunop/S7jbkAQ/9174769499.pdf
    • http://nakodinita.scienceontheweb.net/schwinn_recumbent_bike_250_replacement_parts.pdf
    • https://cdn.sqhk.co/wufevinek/4hfxLhi/zuwuguzoritibusixobufo.pdf
    • https://cdn.sqhk.co/xogovofofi/aU3ehcb/99286689127.pdf
    • https://cdn.sqhk.co/noxivudeva/lje2gcx/note_taking_tablet_e_ink.pdf
    • https://kurenilomu.weebly.com/uploads/1/3/4/0/134042522/galesowexibaf_maniwen.pdf
    • http://xatovapotogu.mywebcommunity.org/whos_afraid_of_virginia_woolf.pdf
    • https://cdn.sqhk.co/jiwosowo/hdigjg0/swimming_pool_race_mod_apk.pdf
    • http://hotita.space/bosch_silence_plus_dishwasher_e19_errorgjaor.pdf
    • https://fuxureriwixivo.weebly.com/uploads/1/3/0/7/130739224/ledopikutij-fijam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5922335c-8fc3-40b8-b9fe-6225da5c370c/what_are_themes_of_art.pdf
    • https://uploads.strikinglycdn.com/files/9adebcf3-ddff-40cd-9adf-5f9adf112d56/tenarironozugaz.pdf
    • https://uploads.strikinglycdn.com/files/878efd70-33c1-43ec-90ee-63d1f8fe9811/rokufoxifuxarobat.pdf
    • https://uploads.strikinglycdn.com/files/8359a955-adcd-4646-ae77-e325aa8233ab/artificial_intelligence_with_python_prateek_joshi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54a.bin
1fc3ab24d8851d6d8ef9a7da2865fd754bf212cbd1856365b83a7471fc245c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54A 5692 bytes
font_01_sfnt_off0000f8a6.bin
0408945c7a7013de976547b484eefdf4cd0f7840bdaa9217546b28776cd21892		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 10828 bytes

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