Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b5b2c57d261b82…

MALICIOUS

PDF

67.1 KB Created: 2021-03-15 05:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3cf7de16c7927374a109477b4b64081 SHA-1: 5a3e34d90dec7dd9beedb5b90c005469babaf72c SHA-256: c9b5b2c57d261b822ea20013d1011283d701e73940bbbc13adb2bcc9a2ee9d36
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, specifically 'https://resalured.ru/123?utm_term=faa+far+aim+pdf', suggests the document is designed to redirect users to a potentially harmful site. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, suggesting it may be a crafted PDF designed to exploit vulnerabilities or deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=faa+far+aim+pdf
    • http://xoziduso.mypressonline.com/3620827671.pdf
    • http://zusagukitu.mywebcommunity.org/45530742867.pdf
    • http://kufomabid.mywebcommunity.org/artropodos_unam.pdf
    • http://barajofa.mywebcommunity.org/rinnai_boiler_error_code_12.pdf
    • http://mitedujonajezed.scienceontheweb.net/bukapem.pdf
    • http://zutelotojenexop.getenjoyment.net/gurodekuz.pdf
    • https://jiwedizuku.weebly.com/uploads/1/3/4/3/134310564/9478b5c4bd6065.pdf
    • https://tupipano.weebly.com/uploads/1/3/4/5/134598946/mufife.pdf
    • https://powigakiluxoja.weebly.com/uploads/1/3/4/5/134521341/menideve.pdf
    • https://bezamefiparafu.weebly.com/uploads/1/3/4/6/134665790/gizadiwirawugo_zivot_wupawunozewixo_vebofitefevod.pdf
    • http://xikumidevulofo.iblogger.org/bypass_icloud_lock_tool_full_update._zip.pdf
    • http://sagedix.medianewsonline.com/stihl_blower_vacuum_battery.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_74dda7db84c94aa9ba87cba678b491b2.pdf?index=true
    • http://vuxonisozezuxov.rf.gd/lapetavu.pdf
    • http://zodiripek.myartsonline.com/how_to_test_pressure_switch.pdf
    • https://s3.amazonaws.com/donukadizolin/bosch_washing_machine_6kg_manual.pdf
    • https://s3.amazonaws.com/vukusa/blitzkrieg_2_full.pdf
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_cce867fe55be4c86bb16bf1b39b9e9a3.pdf?index=true
    • http://www.faa.gov/regulations_policies/handbooks_manua
    • 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_off0000caa2.bin
787474db5c836d33b4480b4477d826237d15b2e9e7fee0d5823790fde386a080
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 4932 bytes
font_01_sfnt_off0000db58.bin
46b9671ade7e0291b4acbdfb48409f4be38741661a0b4765521608dfafc2b3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 10608 bytes