Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1ea971e62f4c96…

MALICIOUS

PDF

97.0 KB Created: 2021-04-04 18:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0134fe85b90d09aadff60c369d09f275 SHA-1: 5844a491b0a4b355fb55a980944cf06378052246 SHA-256: 0c1ea971e62f4c9679f3034c2ec5df3b836b672a04e05140d0e1112db606975a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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 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://leonvi.ru/123?utm_term=warlock+destro+leveling+guide PDF link annotation
    • https://pudogujapoveg.weebly.com/uploads/1/3/6/0/136090910/8662066.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_602e1f4384681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_60313ee1be967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421787/normal_5ff917924655d.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/nepodawowebo.pdfIn PDF document text
    • http://dizofuses.mypressonline.com/adding_and_subtracting_rational_numbers_word_problems_worksheet.pdfIn PDF document text
    • https://ripabefemedoge.weebly.com/uploads/1/3/4/3/134321398/gokusa.pdfIn PDF document text
    • https://sozumibazukupiv.weebly.com/uploads/1/3/4/7/134735026/wobeb_genefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_604fe56437a6d.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/gumegulaxi/40053079385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b527e204-2329-433d-9461-ee7a4b2a0206/juxipibarope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb35f92-35d9-4cd9-b019-1bd47c4e3963/is_homework_important_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b3fbdd-5774-49c0-8b60-846d7f9226f1/lutetagexusibupod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07dd1103-722f-4fc2-a21b-337d7c704823/63607679812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a15de4-debf-4ac5-b446-25efd8dd6168/96107648642.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/transmissible_spongiform_encephalopathies_definition_microbiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6764bf0b-d3d3-4bfb-b041-7b0ab1e6fa00/ariana_grande_a_few_of_my_favorite_things_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/sademotekorifowuv.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/78590091868.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_off00013c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C07 5244 bytes
SHA-256: 9d7b67c381102c373e572098dd1f9ff3a55ff9b5a80ea8c27fd7b9406b097d46
font_01_sfnt_off00014dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFE 12072 bytes
SHA-256: bb89f9aa00b76f6b17bd0aae553fa39205d2b3c9504ccdcd8ce4a8277d8b366e

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