Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d558eeaee9fef3…

MALICIOUS

PDF

82.4 KB Created: 2021-01-05 06:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3a214f4fbdd939b34d792a4e6acbc9a4 SHA-1: bdb9366feee07b6b721e1cc0e61a88e61c0eaaea SHA-256: 95d558eeaee9fef3fd688ebff0347c371b2267454d7acab4dffe376ede36f068
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a mass of external links, identified as a link farm, with the primary URL being a lure for 'analytical cleaning method validation guidelines'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafficel.ru/aws?utm_term=analytical+cleaning+method+validation+guidelines PDF link annotation
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/ba5782050537157.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/likovero-lowusa.pdfIn PDF document text
    • https://daxozeke.weebly.com/uploads/1/3/4/3/134322415/4552063.pdfIn PDF document text
    • https://gepinizidewepi.weebly.com/uploads/1/3/4/3/134305752/bokasapakuge_foniwelizutana_natarepu_wutujawebawode.pdfIn PDF document text
    • https://ziloboze.weebly.com/uploads/1/3/2/6/132683463/pufezajuge.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/nazekisigiduz/how_to_make_a_broom_stand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee615c8-c221-49d0-816e-c36aaf8d920f/where_can_i_buy_used_exercise_equipment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddf17ab-2ae4-4a59-86a1-bfc49298dd8c/70617404205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e883ef0a-7bcd-4c04-abd2-1e61333945f8/kohler_whirlpool_tub_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/98340886004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42e6944-1879-4e3b-ac99-e7930a1a55d3/ketogenic_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd725725-a074-4396-b071-8055fb85e480/lorex_8_camera_security_system_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e908bd-6e44-41f7-ae0b-1a0ca1120ae9/law_of_universal_gravitation_problems_worksheet_answers.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_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 5408 bytes
SHA-256: bd18b0d02c3eabace2c0bafc53d1521e496c7d603e38dc3018855a7e31c015a9
font_01_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 11004 bytes
SHA-256: 462f6a4a565802ba00a15909d7dd2ca21c90bf68e1e722ea05387f010031f361

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