Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7aac8b97fefea8…

MALICIOUS

PDF

86.0 KB Created: 2021-03-18 01:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a85fca3ec41cd75c0cf57072d5e873a SHA-1: 74352a876e01343709fc443a2f4387d8f5ddad75 SHA-256: ec7aac8b97fefea8ef8f217bbb61b4fff140536ba4affc2249c1c2514c3e0953
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://golowaki.ru/wix?keyword=solution+concentration+worksheet+%2528section+12.3%2529+answers PDF link annotation
    • https://wivujugojuz.weebly.com/uploads/1/3/4/8/134883460/zubaxotalu.pdfIn PDF document text
    • http://bajuzupur.22web.org/5008949839.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/hdhizbk/41344735480.pdfIn PDF document text
    • https://kikurebimeko.weebly.com/uploads/1/3/0/8/130814200/bubisije-furadimikofos-jajerazabes.pdfIn PDF document text
    • http://dedarijaluwonu.22web.org/sazijolerapixuxalini.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/gIKEPlD/slice_of_heaven_wareham_phone_number.pdfIn PDF document text
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/af8ae4.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/loxopudizus/machine_learning_algorithms_jason_brownlee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c4508e-5183-4f8f-929b-e103db676df1/razefavim.pdfIn PDF document text
    • http://matixonapoler.epizy.com/commas_with_dates_and_addresses_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/alzheimer_dementia_treatment_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c636237-7657-4362-8f59-90c07cfe7c31/13929348332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3026edf-bce2-4ab8-9538-b8efbd7feb41/78909517144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33301474-d4b0-473d-b31b-ca12cd9d5437/fotuxozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e04ab6-5357-47d9-a8ff-22af433ff278/99345164772.pdfIn PDF document text
    • http://sobajagas.rf.gd/buried_child_sam_shepard.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/mawovekopegirovudoxaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e1173a-faf7-4d47-82a9-1ba9a02ab3bd/liwopikeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc59cdb-d357-4570-b31d-585c5f964848/marshall_mg100hdfx_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/kubofepakewakewob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d690b29-b7b8-4000-9c44-ee21e400ce23/kuwikez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bba8f31-a448-43cc-b9fc-2b3b407b6cb9/65523006046.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_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 5680 bytes
SHA-256: 3cf538c8c329783293543c2bdb804b58d2ab107de4a9d41bc00f1a7ada8e39d4
font_01_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 11904 bytes
SHA-256: 7e25caa904282d1bebe959ef598ae13bc9926c51af541e82afb6cdf8292236e2