Malicious PDF — malware analysis report

Static analysis result for SHA-256 0254379f740bd30f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-13 13:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 01b8b23ae70b1e985a55993f5ed544f4 SHA-1: 2b259f020551c33fdb7746670ac49f5e8a46132f SHA-256: 0254379f740bd30facdaa18c7cdd25a11af625946f1b7d52e290578fdb9a0c7c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://druttle.ru/strik?utm_term=what+is+torah+law PDF link annotation
    • https://cdn.sqhk.co/rexixugepir/Zx9Dfge/anatronica_free_for_windows.pdfIn PDF document text
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/mufurutibafopo-tavusemebuvup.pdfIn PDF document text
    • http://dimakuvojekoko.iblogger.org/wexasalujakejaziponu.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/Aig4jjD/66491328978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_60125245345ed.pdfIn PDF document text
    • https://nuvosukive.weebly.com/uploads/1/3/4/7/134718285/7266450.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/jf2TWwO/27107486.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/dcxjaav/78002776032.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/compressive_strength_of_mortar_cubes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464735/normal_604772514fccb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491175/normal_60058010b8cf7.pdfIn PDF document text
    • http://gotiwekiz.iblogger.org/mimitujelabijodew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_602feeb5c3b54.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/a369b0fc-64db-4a4d-bf34-4ea6dc61d358/43754434056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03eef77-ebba-458d-8a0a-2179ed217d2e/a_cuanto_equivale_10_pulgadas_en_cm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37442c0-5070-4236-bac1-fb146c902313/92598188089.pdfIn PDF document text
    • http://ledolabufimo.epizy.com/65888494077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f981cc-1b5e-46d7-9cfe-0efd95ec0053/33229592382.pdfIn PDF document text
    • http://samakejami.rf.gd/13533633070.pdfIn PDF document text
    • http://zipoxibel.epizy.com/9406657706.pdfIn PDF document text
    • http://dileginaduke.epizy.com/aia_group_medical_form.pdfIn PDF document text
    • http://puxabilaxomim.rf.gd/graphic_design_the_new_basics.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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 4880 bytes
SHA-256: 5e675c51b35d72bb78194fcf1a62963a2959fc7ed2950ce3a9dbdf662c7aa3f3
font_01_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 10764 bytes
SHA-256: c835fdb0b0efa270bcddbfecfe2847ed1395753c790fc457b8cc1489e8f002f2

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