Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37c298ffaf37dcb…

MALICIOUS

PDF

76.6 KB Created: 2021-03-28 12:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 64cf908f132c596eb30ae75f30c6264e SHA-1: d6669a7c7cfbe05a3ada2aeedff8a8b8dcedf680 SHA-256: d37c298ffaf37dcb266c03fe297945205de098d10b364c0c6333fef9cb563aa6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure point towards an attempt to exploit users, likely through social engineering or by serving a malicious payload.

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 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://baarspo.ru/wix?keyword=violin+fretless+finger+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/xawefigi/dOMgjha/9457590015.pdfIn PDF document text
    • https://cdn.sqhk.co/kinirebuseva/dgc1jgt/dodexixez.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/streetcar_named_desire_analysis_scene_44fy7q.pdfIn PDF document text
    • http://carbags.site/feminism_is_for_everybody_chapter_7_summaryq6714.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/908730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_600f1952e62ef.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/Yg4hijf/tenuz.pdfIn PDF document text
    • http://nodefiw.medianewsonline.com/brother_andrew_god_s_smuggler.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/35514513209.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/wetugi.pdfIn PDF document text
    • https://gujinaberukigav.weebly.com/uploads/1/3/1/8/131856979/zowudelefejepeked.pdfIn PDF document text
    • http://fdvsefwfrw.space/58029185939sneyi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_6023828a86943.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/miduxikusenerapu.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/5579dbdcaa8c.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/gBifhgy/85654112979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujidafedisezu.atwebpages.com/26756081824.pdfIn PDF document text
    • http://kegigija.atwebpages.com/kogiwaralivum.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/15672084055.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_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 4964 bytes
SHA-256: 66f0dba03936e80d35fc0feac476a793c3797f9671a35c7e51d18463c163fd32
font_01_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 10972 bytes
SHA-256: 5f7783204718042b1931bc7f674e0e9c41c5c3245353505f8547f527b4f7ea09

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