Malicious PDF — malware analysis report

Static analysis result for SHA-256 3867a8fcf248bb4c…

MALICIOUS

PDF

71.8 KB Created: 2021-02-16 17:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: de1a459a0c1416cd3a3b61a96d0120aa SHA-1: 6e74c8bd8b15a1d53109043a73d6e2c7f058b698 SHA-256: 3867a8fcf248bb4c08ed1933bc5e844d5c4baf4c97dafce9de4447c1f7ac64e9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one pointing to a suspicious domain and others to S3 buckets. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

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://druttle.ru/123?utm_term=someone+like+you+keyboard+notes+easy PDF link annotation
    • https://cdn.sqhk.co/duponetix/Egjhbgd/gutexuliwudabupikoxeki.pdfIn PDF document text
    • http://mon-cmb.best/weka_tool_tutorial_for_data_miningctz0m.pdfIn PDF document text
    • http://100p-f.ru/mainstays_parsons_cubby_tv_stand_instructionso2pkc.pdfIn PDF document text
    • http://idealslim-ordina.site/50714761030a2w69.pdfIn PDF document text
    • https://ginubeputugexow.weebly.com/uploads/1/3/0/7/130738710/natodub.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/9fd48b440896.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/1fa343dfc.pdfIn PDF document text
    • https://vowopazi.weebly.com/uploads/1/3/4/0/134096587/340387.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/6653243.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/podunotupazi_pujikodegimete_rakapam.pdfIn PDF document text
    • https://cdn.sqhk.co/vopirewilofo/hbLjg7r/covid_19_cases_near_my_location_tracker.pdfIn PDF document text
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/bikilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/cricut_heat_press_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/exterior_angles_of_a_triangle_riddle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/pakistan_visa_application_form_for_bangladeshi.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/baahubali_3_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/wuzilepisiku.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/vewidonibibit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 5380 bytes
SHA-256: d1c4a824dce5ba75fdcd3281eebb8a0a00b286125138dcb1b7e037ce43938b5d
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10400 bytes
SHA-256: cf17ff8017dc8150df6eaea4e01c54a9cab87050471eec9ec6426e3b634303da

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