Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef4c9ee21502cbf…

MALICIOUS

PDF

72.4 KB Created: 2021-02-09 00:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 163cd3a7d692078dc963a33dc7f13394 SHA-1: 7c1bd7d08130b92c71a9826e3871fe3510ff36b1 SHA-256: aef4c9ee21502cbfca241c805d180bb232837640ed86b5b6b7f9d642fc4ef103
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting an attempt to drive traffic to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external links point towards a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://bologen.ru/aws?utm_term=overview+chemical+bonds+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426075/normal_60208baf36a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458394/normal_60120e02bd33e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407994/normal_5fcd0858041e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448357/normal_5fdd6f6aa8630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470521/normal_60096a15c36cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5fda3c783acce.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/gufudi_rozapapuf.pdfIn PDF document text
    • https://luxaxezasu.weebly.com/uploads/1/3/1/3/131398230/xujefabosorise_tafaporixepi_foxuzipale_suwuziduw.pdfIn PDF document text
    • http://dowosateti.iblogger.org/64625416509.pdfIn PDF document text
    • http://jazabezul.iblogger.org/total_coliform_count_standards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fc72a1416e59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5ff88073c29d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mujigakevomo.epizy.com/99_kannada_movie_in_tamilrockers.pdfIn PDF document text
    • http://nanefelizili.epizy.com/94616131052.pdfIn PDF document text
    • http://sitotozip.rf.gd/cell_disruption_methods.pdfIn PDF document text
    • http://fipotunisobojow.epizy.com/kitominu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 5352 bytes
SHA-256: f2ef0d521b5db91e6787ac468996e3e0fc5bdf7421f9f039ac112bef32ad5841
font_01_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 10152 bytes
SHA-256: fbc3dda28b3d8d97407d92aa2b02ff111d3f021f508790346e764da2ee4371e5
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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