Malicious PDF — malware analysis report

Static analysis result for SHA-256 f473483e555e8ef9…

MALICIOUS

PDF

72.2 KB Created: 2021-03-27 13:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 245cb74f8e462396a38e88beab002713 SHA-1: f52e24fde80fe03fc6a6e1540b82ead75207659d SHA-256: f473483e555e8ef9189d6547ba56f7a07be4bdaf79998a1bbc84ac8d2db2e7f2
194 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to PDF files hosted on platforms like Weebly and other free hosting services, indicating a link farm or distribution network. One heuristic specifically mentions a 'mass external PDF link farm'. The presence of a URL with a 'keyword' parameter suggests a potential SEO manipulation or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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
  • 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://leonvi.ru/award?keyword=translation+adaptation+and+transformation+pdf
    • https://suwitasejamuk.weebly.com/uploads/1/3/1/8/131856391/gezova_puziziwumenofun_tajexu.pdf
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/5810417.pdf
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/zasizulojiki.pdf
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/pedeteloxegurusubo.pdf
    • https://zukafetovozod.weebly.com/uploads/1/3/1/6/131636890/8d42a2.pdf
    • https://benesigonej.weebly.com/uploads/1/3/1/6/131607635/970805.pdf
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/fc6c70.pdf
    • https://mologikonazo.weebly.com/uploads/1/3/4/7/134706863/bixunafus-luzariji-fumapisofopaket.pdf
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/4610953.pdf
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/favugixosuweto.pdf
    • https://xafovudomogagak.weebly.com/uploads/1/3/5/3/135324285/1709240.pdf
    • http://zazeteku.iblogger.org/kaspersky_lab_antivirus_software_free.pdf
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/tugaxujukerafa.pdf
    • https://pamikiwod.weebly.com/uploads/1/3/4/3/134315686/luvogagataruni.pdf
    • http://negekipewune
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_06afa0cf9a274fad84e91113c106711f.pdf?index=true
    • http://wojuzixe.epizy.com/melunubijobotexapi.pdf
    • http://gedikoti.epizy.com/cmaa_risk_management_guidelines.pdf
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_abef0384ae4b4679a7098e9b30a33714.pdf?index=true
    • http://gusalixofunek.epizy.com/1120s_amended_form.pdf
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_964eb531d625493e954bd1f292a8108e.pdf?index=true
    • http://nakepusigazu.epizy.com/jeriz.pdf
    • http://zelavejifokekoj.epizy.com/curly_caterpillar_handwriting_sheets.pdf
    • http://negekipewunej.epizy.com/banjo_movie_ringtone_pagalworld.pdf
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_2495275acf1043029280dbec9b27ae27.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f94e.bin
0f09b75723423b5954eec91ac1585333d2d9b7ab4236ab0265a15875129b268c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 5136 bytes

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