Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e70a886aa95ab1…

MALICIOUS

PDF

88.7 KB Created: 2021-04-02 10:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 69a4779cf7b2c928b591bdff27e43a4d SHA-1: 5a512053c696c02aa6fe31277871b9efaf81be88 SHA-256: e8e70a886aa95ab1cfba998a03f2eba40a0e35e4f0577388714786c06b2cf3e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a lure-based attack pattern, likely intended to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/award?keyword=angina+pectoris+pdf+download PDF link annotation
    • http://palopepidek.mypressonline.com/binomial_calculator.pdfIn PDF document text
    • http://didegarop.22web.org/atopic_dermatitis_pathophysiology.pdfIn PDF document text
    • http://pokovata.scienceontheweb.net/pdf_to_excel_converter_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_6032c98820216.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/reliability_test_spss.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_6025c27eee652.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/alphonse_daudet_short_stories.pdfIn PDF document text
    • http://losopefopamusoz.sportsontheweb.net/90194193613.pdfIn PDF document text
    • http://nigodofifulo.scienceontheweb.net/63879647382.pdfIn PDF document text
    • http://bapetobam.iblogger.org/sierra_9mm_v_crown_load_data.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogoxuf.atwebpages.com/xefokamepix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28c312d-3b6c-46be-aacd-55f6a15fd1c2/does_jersey_mikes_have_gluten-free_buns.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_eb02c727e2c3452583e5b91e4541b85f.pdf?index=trueIn PDF document text
    • https://b595a6f9-6bcb-48d8-acfc-7cb8c696cf55.filesusr.com/ugd/21f311_477ad5ecfb0643ba9ce10de301dc1449.pdf?index=trueIn PDF document text
    • http://wurebosuloxu.myartsonline.com/ihk_oldenburg_berichtsheft.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_69bc1ff1b8a74793802007a39532d0bf.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_4c4aedaeca8844d9a571dbf62d07bd90.pdf?index=trueIn PDF document text
    • http://ruxurosagogaru.epizy.com/tri_fold_leaflet_template_photoshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be0180c-e527-4be5-9ea8-583d409e289f/85876880592.pdfIn PDF document text
    • http://monudaduxafe.epizy.com/tefinewok.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_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 5404 bytes
SHA-256: 2337b57d79b525697dae16619313e421d8e686604eb937fae481400d4f767b1c
font_01_sfnt_off00012e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8F 11472 bytes
SHA-256: d86568d743aa72c93f3a4b5709fc08d0484e7b2b2adf69dba33f65a5e12a4c7f

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