Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da8bf41d90d14d0…

MALICIOUS

PDF

119.3 KB Created: 2021-06-06 10:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: efd26e1943d931ad9c830946761c2f27 SHA-1: 0bdb6a1ea70fc6572e2fe14f26e5a4703dcb5c3b SHA-256: 4da8bf41d90d14d0246c7dccb25e40d25138c928263773e410276d9609750fe5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pistant.ru/pbw?utm_term=what+is+accessory+muscles+of+respiration PDF link annotation
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/2c9d7a268bf21f.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/2b0776cc4f7.pdfIn PDF document text
    • https://fekolulowezomo.weebly.com/uploads/1/3/4/5/134593542/kudekofasenewuv-tugefalen-tabujuseji-felulalowi.pdfIn PDF document text
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/0c2e63319c.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/9076365.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/gafazinewokovekumime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekokos.pbworks.com/f/74024415310.pdfIn PDF document text
    • http://kevukimugo.pbworks.com/w/file/fetch/144604914/neverwinter_nights_enhanced_edition_android_gameplay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e74d32-581e-48fc-8042-8e02313d405e/31248664692.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/27009015058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f411c0-e421-4bd1-a61d-18cdeedc5312/diferentes_tipos_de_sistemas_operativos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b00f2b2-19aa-4211-b7fd-b2ab9a9431dc/sipavitogegoramibomajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2319b16a-e280-4f91-9367-aeee15870ffb/how_to_drain_blomberg_dishwasher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b68a0a-a253-42aa-b57f-691107565987/the_taming_of_the_shrew_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c055cd-1d5a-4249-b7c2-424198524be1/clave_de_producto_para_office_professional_plus_2019.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/can_you_cheat_on_your_partner_in_sims_mobile.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/w/file/fetch/144452001/partitura_piano_iniciante.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_off000195a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195A1 5372 bytes
SHA-256: fac252e9ce6ceb7693ba6c7c49bc4cc9ff02afa1b0956ad3b66da1f0268e2316
font_01_sfnt_off0001a7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7D0 11908 bytes
SHA-256: 9a3c11ac17637b20cab92dbc1f0f3583e1cb38fb62d8e42f1036024f8ca87633