Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bdc8f9e8b03186…

MALICIOUS

PDF

74.4 KB Created: 2021-02-21 21:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bb30a41b6916dd625bc52750e52a18af SHA-1: afdce78fa76d38fcd54017282c4fcf21f7a32b0d SHA-256: 23bdc8f9e8b031862df9336b10160e19e7a4678529308ef1cce38eaa890d1180
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary one leading to a URL that appears to be part of an SEO link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

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://leonvi.ru/strik?utm_term=how+to+reset+filter+light+on+elkay+water+fountain PDF link annotation
    • https://wilegefozuf.weebly.com/uploads/1/3/4/3/134399327/4849122.pdfIn PDF document text
    • https://novazoneb.weebly.com/uploads/1/3/0/8/130814043/9b095d.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/4879311aaa.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/5271711.pdfIn PDF document text
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/rurukoramesovim.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/3623377.pdfIn PDF document text
    • https://gulipuzajetag.weebly.com/uploads/1/3/5/3/135397689/bb0f12ab.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/917233.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/suximawo/guidepoint_pharmacy_longville_mn.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/45247986078.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/breaking_dawn_part_2_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/list_of_unscramble_words_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/budesonida_formoterol_preo.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/teamfight_tactics_tft_item_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/lancashire_county_council_pension_fund_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/55656785669.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_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 5248 bytes
SHA-256: 2486f01b8e3aa4fc98580196de0a25eab4c0489d9caf812b409c816346b89197
font_01_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 10316 bytes
SHA-256: 1d0903d26087cafa04140b7901919c607530f36981d8c577fc112cbcd773cb51

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