Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a54ac4d0b89bbdd…

MALICIOUS

PDF

100.3 KB Created: 2021-03-28 17:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 2c3c9cf7b94fe560fa22a890892c3b98 SHA-1: 9a51377929a6f4b5d690fdf7f9d3532881884c47 SHA-256: 3a54ac4d0b89bbdd45800bd23d9408aa8c203fa1ce305245a4042586b7e91f21
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though partially garbled, contains keywords related to software downloads, reinforcing the lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to drive traffic to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/award?keyword=autocad+to+pdf+converter+free+download+full+version+with+crack PDF link annotation
    • http://vumajuzatijerak.getenjoyment.net/waladereja.pdfIn PDF document text
    • https://kitomejefu.weebly.com/uploads/1/3/4/1/134108571/fc1021250caa.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/aptransco_notification_2020_download.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/wexakogumuxetejet.pdfIn PDF document text
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/0fc044ba3a2fa.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/cv_of_civil_engineer_fresher.pdfIn PDF document text
    • https://sadejakudabad.weebly.com/uploads/1/3/5/9/135965210/lowolimivigim-rojubarod.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/2a74e0aee489.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/79795343436.pdfIn PDF document text
    • https://serogewuf.weebly.com/uploads/1/3/4/6/134615077/8858966.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/komevopowixanelivek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2985339d-3b6e-4370-9898-959435558bdb/wendys_nuggets_nutrition_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c9895d-2c2a-40be-8abc-fce2a784078e/3083297888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19677cab-9fc8-420b-a9e8-4753bba0b001/67654218890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa46474b-f1f1-455a-97f5-8c57d28add8c/how_to_determine_stronger_intermolecular_forces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c485ddf0-bbbd-4ab5-847f-7613b1b5f481/samsung_un60fh6003f_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e469e2-10de-4785-9a0d-9211f5c485c5/bosch_glm_35_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b718508f-6b45-4373-9c45-3169f910d031/webaropukonivoxuvanaxilim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2181eb2-fa20-4781-be63-f93af2270a04/what_does_nolo_mean_in_english.pdfIn PDF document text
    • http://batapijas.myartsonline.com/bullish_engulfing_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7f5c5a-80c8-4084-b84b-b59ee16dd846/62698363253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b986eb-de43-4048-9a81-ae99162cf66d/ubiquiti_nanostation_loco_m2_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65928d9e-df60-4687-8d6a-6fe00af0da23/gowarelokabesetakumurevap.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 21940 bytes
SHA-256: ca6d183823fa8e6d3c27e25842fdaa2389d7c6de912fd1c8c27497cc3c7aa183
font_01_sfnt_off00013bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC0 5328 bytes
SHA-256: 4512ef64dffe511b86c9266adaba578aff651ce916aa5042f333b41b7d0312a3
font_02_sfnt_off00014de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE3 11116 bytes
SHA-256: 8dbd467108e0655ef5630885677326d85e17b7ac3c4cab755da6ce60211dede4
font_03_sfnt_off000173f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173F0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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