Malicious PDF — malware analysis report

Static analysis result for SHA-256 83785bb6396ffa02…

MALICIOUS

PDF

71.3 KB Created: 2021-02-15 19:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 712642ddf1de951ea575acb1abf53cd1 SHA-1: 8344bc0058eafd6614b0101181a01581f76f9b1d SHA-256: 83785bb6396ffa029a714b615dc476719f91752551654058557f616d72ba9db2
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=when+is+the+renaissance+fair+open PDF link annotation
    • https://cdn.sqhk.co/kasesiseb/uifrghh/lemeda.pdfIn PDF document text
    • https://fibadajemuda.weebly.com/uploads/1/3/2/3/132303382/kerugid.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/comparative_and_superlative_sentences_worksheetsytggw.pdfIn PDF document text
    • https://cdn.sqhk.co/vapatibu/yHRPSij/fosemexanufativola.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/jfOaS7l/sorosa.pdfIn PDF document text
    • https://cdn.sqhk.co/vovigewuva/4ieiihj/xalewot.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/xedimimuwawav-xoxof.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/hjgLhhB/bloons_td_6_free_download_pc.pdfIn PDF document text
    • http://tryraisins.club/addition_maths_worksheets_ks102x7g.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/ghxTpzD/find_my_iphone_friends_location_not_found.pdfIn PDF document text
    • http://xploitcrew.io/truck_driver_cargo_old_version_downloadq75pw.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/iWidQie/wifovojafikaxutusejogole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385635/normal_5ff49e5680616.pdfIn PDF document text
    • http://naderuromopuru.22web.org/attestation_de_travail.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5fee4f1b5a0ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenemusexo.epizy.com/avabel_lupinus_item_guide.pdfIn PDF document text
    • http://tuzikarowom.epizy.com/bikelu.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_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 5084 bytes
SHA-256: 9613b47aacea488e20e68a82b867679597b170a249f528112f99cf2b4be841a3
font_01_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 9812 bytes
SHA-256: 439cd9006165dbc00f9d5145ae7fbdabb59d5cacdcee656ae96551e049f7188a

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