Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f934a9f7f77b1f9…

MALICIOUS

PDF

75.7 KB Created: 2021-05-12 20:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9c6e223d3bdfc1106446ce8a703d9a1c SHA-1: 6d5f1c94d08a5eb702fc585deea1e657a7913e13 SHA-256: 3f934a9f7f77b1f9087cf6e9a96d73b65a6db9fdbeb7118b63300b6bc1f674f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=hormonas+del+sistema+endocrino+y+sus+funciones+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447431/normal_602c5bf5a5285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_606727777049c.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/29844336784.pdfIn PDF document text
    • http://youralteragoods.com/fumedolef4rsz5.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/27866417642.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/why_birds_attack_in_movie_the_birdsq8sif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakefidefunes.rf.gd/slope_intercept_form_to_standard_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0817931-de86-4254-a2f0-ad0d8f174adb/impact_of_globalization_on_indian_agriculture.pdfIn PDF document text
    • http://repofifimi.epizy.com/70177162126.pdfIn PDF document text
    • http://xojodoruxima.epizy.com/marriott_s_practical_electrocardiography_11th_edition_free_download.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_98961c2269d142ecb40e4daa61df9eda.pdf?index=trueIn PDF document text
    • http://jitawidavez.atwebpages.com/xuruzadapomabovijewaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5814b5d-4098-4828-9d45-293bdc7b10ee/girexa.pdfIn PDF document text
    • http://nozamoto.epizy.com/8803990077.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/lanelujabitojanapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e1225f-eef0-4c03-b93c-bf88b922f314/famous_persuasive_essays.pdfIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_78664dbb0384464bb6d989ad81bcfce9.pdf?index=trueIn PDF document text
    • http://zejusamipokera.myartsonline.com/data_science_from_scratch_download.pdfIn PDF document text
    • http://figupowogo.rf.gd/bootstrapping_machine_learning.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_494eda73cba042afaa211758e31f5123.pdf?index=trueIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_0da3ef7848654c35ab043beb16e61a2a.pdf?index=trueIn 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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5364 bytes
SHA-256: 68dd6ee309156840aa65fdc8b76892272f47d3298995139b12d9396d46ec7bf2
font_01_sfnt_off0000f9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 11580 bytes
SHA-256: 0bf322f7e256c2819cbf9bf225d283ff3e1482cd0550f75ce64265e6262e6ca9

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