Malicious PDF — malware analysis report

Static analysis result for SHA-256 809867029395604a…

MALICIOUS

PDF

74.4 KB Created: 2021-03-07 09:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebaa36e87a1618b2570bc2780b758862 SHA-1: e99d86296a8a5a4acc370fb542c0ba246328b0fc SHA-256: 809867029395604a4362c25425cc6a37a3e746b63e411ff01361902ff3e337b3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. The embedded URLs, such as https://vilenefex.ru/aws, further support this, pointing to external resources that are likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://vilenefex.ru/aws?utm_term=easy+things+to+paint+for+boyfriend
    • https://tijotado.weebly.com/uploads/1/3/1/3/131382447/1312036.pdf
    • http://msertis.xyz/acids_and_bases_worksheet_2_answer_key8k5hl.pdf
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/3040320.pdf
    • https://cdn-cms.f-static.net/uploads/4421354/normal_6029497e00360.pdf
    • https://static.s123-cdn-static.com/uploads/4455894/normal_5ff41934ecd67.pdf
    • https://static.s123-cdn-static.com/uploads/4470835/normal_5fe20553506d4.pdf
    • https://ridejotewofo.weebly.com/uploads/1/3/5/3/135314456/8257745.pdf
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/22c75a.pdf
    • http://gakmancreatures.ru/florida_driver_s_permit_study_guide1jk5v.pdf
    • https://cdn-cms.f-static.net/uploads/4469849/normal_5fdb0c3f2309f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pegesij.rf.gd/rakovokonun.pdf
    • http://piwenetawomot.rf.gd/rite_aid_blood_pressure_monitor_symbols.pdf
    • http://pamokozamusakas.rf.gd/awlgrip_color_chart.pdf
    • http://gadubuwarin.epizy.com/dibukigidob.pdf
    • http://bufixel.rf.gd/jugakupij.pdf
    • https://uploads.strikinglycdn.com/files/a1ea22b2-47ca-4ddd-b87e-1205ea5fdb7c/zebuxewemegepuwawuji.pdf
    • https://uploads.strikinglycdn.com/files/3373578b-08d0-4fbc-ba31-b9b408a36768/51693470261.pdf
    • https://uploads.strikinglycdn.com/files/1569f575-9cb9-4ddc-a208-52b111521385/apollo_twin_usb_osx.pdf
    • http://xumizaxojumiko.epizy.com/bowigimuxobe.pdf
    • http://rukujabaxelab.epizy.com/brother_hl-3170cdw_printer_in_error_state.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_off0000e4df.bin
c89f9cbbcfbddb96a0ec77052463a22623c2f01700a364e4f2cf8e075d0ca014		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 5472 bytes
font_01_sfnt_off0000f778.bin
0557467b5181a2a6554635c7b1eba81c6d026334ecc9e37e3cbf95768b50f3ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 10880 bytes

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