Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a7b2484d01e296…

MALICIOUS

PDF

70.1 KB Created: 2021-06-07 09:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8035c10f03aa61c6810f71bd15cd4c1a SHA-1: c82a989c3c93b07636f9b95e2f2fdd1e0e407933 SHA-256: c9a7b2484d01e29638ec4212aab17db25309b570b7c8e539ae7a2cf540675812
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services and employing UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/pbw?utm_term=flower+of+life+symbol+images PDF link annotation
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/xewokira-jidipirala-gosugedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_6029249167813.pdfIn PDF document text
    • https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/pudixoke.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4463809/normal_60b52840ba646.pdfIn PDF document text
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/4e881678238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimepovume.pbworks.com/f/how_to_code_lua.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144515481/chemistry_all_formula_chart_jee_mains.pdfIn PDF document text
    • http://vixifalino.pbworks.com/f/motorrad_ttx_250_limited_ficha_tcnica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b999c59-2b53-40da-b7d6-1055bad13822/xofodatowezolewas.pdfIn PDF document text
    • http://polubisoxuwo.pbworks.com/f/how_to_reset_a_roomba_980.pdfIn PDF document text
    • http://palejemevat.pbworks.com/f/filmora_video_editor_full_version_free_download_for_android.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144718347/acids_and_bases_crossword_puzzle_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef002dc-cd15-41e8-81ee-154d217c66de/sibosuluberudinak.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144599895/what_age_are_horrible_histories_books_for.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144449712/how_to_start_a_pig_farm_in_kenya.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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 5376 bytes
SHA-256: 5b1647cf62835e495b03d8c5d2e0755e5cdc301d88d7ad054167280baf805dfa
font_01_sfnt_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 10156 bytes
SHA-256: d051ba8ce4156c3a6c5457d4118cc1d5d572d7f32beb44bb24d0da757f472529

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