Malicious PDF — malware analysis report

Static analysis result for SHA-256 182b1f2d0cf0dbc0…

MALICIOUS

PDF

71.7 KB Created: 2021-03-28 20:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d6d0905bbad90bfb2f2555ac7e0f70fa SHA-1: 93b77c24380343ab78aba8c9a3d78bd2c423d66f SHA-256: 182b1f2d0cf0dbc04b4970d71f20ba74b8015123c8afe19e06049b972910c9b0
126 Risk Score

Malware Insights

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

The file is a PDF containing embedded URLs, one of which points to a suspicious domain ('ponafet.ru'). Heuristics indicate it's a link farm on disposable hosting and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The document body is heavily obfuscated and unreadable, but the presence of external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=acc+aha+lipid+guidelines+2020+pdf PDF link annotation
    • https://miwebuzoz.weebly.com/uploads/1/3/4/0/134095964/wujozo.pdfIn PDF document text
    • http://setafugeridol.scienceontheweb.net/barikaxugerizizorojakuz.pdfIn PDF document text
    • https://xumomeroruv.weebly.com/uploads/1/3/4/2/134266579/4780983bcb1fb13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5fd869a253bf8.pdfIn PDF document text
    • http://vanlit.ru/15143169774tta93.pdfIn PDF document text
    • http://twoup-viktoria.online/12671171521mjol5.pdfIn PDF document text
    • https://bibomezu.weebly.com/uploads/1/3/2/7/132710601/gejivo.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/how_to_create_table_of_contents_in_word_2020.pdfIn PDF document text
    • http://instacopyrightcenter.com/mp3_iwan_fals_kotav1n9q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_60299adddcba8.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/a_level_biology_past_exam_papers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_605866ec3f212.pdfIn PDF document text
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/dobugirajasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b7e92c-503c-431b-9fd7-f691d4facb8a/16088148828.pdfIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_773ce8f67f614062bb36f8a6ac2d4dc3.pdf?index=trueIn PDF document text
    • http://vujuvisesakok.myartsonline.com/jikafopejedilig.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_6859e464fca646cab8ec65cfad99eeef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0cc563-7312-4b63-82af-bb54b1623f09/39990654295.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90bec2a4-aca2-47f0-ac7a-6a264d45d0d1/best_battletech_mods.pdfIn PDF document text
    • http://suxazetevuzo.onlinewebshop.net/periodic_table_of_elements_with_atomic_mass_and_valency.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_b87e043d4c0044e8b66a4781a05598ac.pdf?index=trueIn 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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 5584 bytes
SHA-256: d477e78b41f97e0d90f1002c7af719322c30e03b68013b608085d2de1e1a1b85
font_01_sfnt_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 10552 bytes
SHA-256: db0a31d681aca6822e813795745b35c443140807d12a2fcf0579d2a592763130

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