Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82d51a3688efe50…

MALICIOUS

PDF

73.7 KB Created: 2021-03-14 09:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cca0260494b58309402c4df6b73d9b90 SHA-1: d3deb3fd9c602a5d8f450294852af8efdbb1848a SHA-256: c82d51a3688efe507a1dc8136687ffbd04371573c4c0456452f8abd8b9df49ce
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification strongly indicate an attempt to deliver a malicious payload or phish credentials.

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 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://druttle.ru/award?keyword=basics+of+digital+photography+pdf
    • http://copyright-supporthelp.com/35409606162dowx1.pdf
    • http://zeboxagekej.sportsontheweb.net/computer_organization_and_architecture_syllabus_iit.pdf
    • http://feedbacrnz.space/9663835820jbct8.pdf
    • http://zarabatyivat.ru/cuento_las_vacas_de_quiviquintay3t4x.pdf
    • http://ueuniti.website/743231430618iqzl.pdf
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fe0a8571b654.pdf
    • https://cdn-cms.f-static.net/uploads/4467322/normal_603a44cfe4d48.pdf
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5fd2caca756ae.pdf
    • http://manovina.mypressonline.com/5376961221.pdf
    • http://gallery-shop.site/remember_your_roots_sign33mau.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_7a7d79af4d0343a49b167c9290e3ff4b.pdf?index=true
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_8c9e876ee49a44cbb226253013f363cc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2ee7e049-0d43-47fd-96f2-cacd96537841/my_chi_health_kronos.pdf
    • https://uploads.strikinglycdn.com/files/ed791f8e-d7d4-47fb-86ea-1b63888bad78/genie_co2_lift_parts_list.pdf
    • http://lufapot.epizy.com/group_messaging_app_for_iphone_and_android.pdf
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_3b20be4db822428688699582d806669a.pdf?index=true
    • http://gijufebevavudep.rf.gd/zobewabiruma.pdf
    • http://fozozip.onlinewebshop.net/a1277_transistor.pdf
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_6087d6fdb2dc4f24a51173c1ffb2cc01.pdf?index=true
    • http://tipopetudigovib.epizy.com/puxemupep.pdf
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_8dc96e6b5c2b437c9be719ef71686a42.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e150.bin
53b2b9fe90dad6774ab0fe23af31e284c07ca7a30590fad0f418e609e5ec15cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 5568 bytes
font_01_sfnt_off0000f447.bin
1fb37bbff81a4f20a2c883d3cdcb50a5cddb2f1643d9fccac1e4dc88feffcd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 10924 bytes

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