Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a93b6961c212e0a…

MALICIOUS

PDF

75.7 KB Created: 2021-02-04 13:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 64e5d31fbe51915995c7de5f020b8a35 SHA-1: ce475846acc13a029c5f81750cc97f94529a86df SHA-256: 0a93b6961c212e0af17fdbd97f1743b89d8b6b697377ad4455baa185c112a95c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/wb?keyword=lung%20cancer%20staging%208th%20edition%20pdf PDF link annotation
    • http://mritzoliver.design/american_escape_room_zombie_apocalypsexr5a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406223/normal_5fff264b51989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5fd89b4312a4b.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/xIgjji5/fiboko.pdfIn PDF document text
    • https://petabururumeje.weebly.com/uploads/1/3/4/9/134902787/5643321.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/cgjbha5/semetabukinefutopapixuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5ff64b0638528.pdfIn PDF document text
    • http://ighelpcenter.xyz/computer_science_gcse_revision_notesig4xh.pdfIn PDF document text
    • http://groby-ritual.online/robots_and_aliens_lyricspxl07.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/jbjgghx/jio_mobile_recharge_online_by_debit_card.pdfIn PDF document text
    • http://55571.ru/code_39_barcode_format9pnsu.pdfIn PDF document text
    • https://lewefuno.weebly.com/uploads/1/3/4/0/134041273/kizevuzunater-bagakexom-lodipex-nelitefapa.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/hbiajeJ/sazegir.pdfIn PDF document text
    • http://reduslimitalia-official.site/enderal_calia_romance_guide73ftf.pdfIn PDF document text
    • https://rivezotuxo.weebly.com/uploads/1/3/5/3/135337491/3306618.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/puzedun_vikadinimukele_xukidaridixogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 5520 bytes
SHA-256: ac6e1fe4157cfd44981237154e510e241b3f8bc1a01098f2fe301636c86fa6f0
font_01_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 10112 bytes
SHA-256: de2fe687229a553a2ebe381d7ca85c75d168aa02d2e42fe3f6ffefaa44837ff2

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