Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43a3bfed89d541b…

MALICIOUS

PDF

87.0 KB Created: 2021-03-05 11:38:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 57c7fe3869176da3d8723a4c504fcd1d SHA-1: 80eb9f1ebe1661ecc9aded170f18c2c6f4b83c5c SHA-256: c43a3bfed89d541bbfc91b86146e739a9d8e3caeae42f91c757373b2f842815b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one leading to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/123?utm_term=electric+ice+cream+makers+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394068/normal_60240580a02eb.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/tibinarodomexusopirilapix.pdfIn PDF document text
    • https://xipuzitob.weebly.com/uploads/1/3/4/5/134523495/tutigugi_nijira_powaruwojami_warudatipubak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5fcd35a0e10ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498348/normal_60038b7f6b1a3.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/japikowixivulobosekabanug.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/which_is_the_best_software_to_develop_android_apps.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/gixipemeguvibunil.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/5191961260.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/xogebuwi.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/is_sonic_soft_serve_real_ice_cream.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_6037f38f88073.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462980/normal_5fe490609d00b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5fe9037edacba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475872/normal_5fcb7baf59396.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/60c16a1b61b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_5fe8f494b0a00.pdfIn PDF document text
    • https://buwumesuja.weebly.com/uploads/1/3/5/3/135303403/12b2e0eab5.pdfIn PDF document text
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/7962886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_601f08a6bf517.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/omron_bp652n_wrist_blood_pressure_monitor.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/22352025571.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_e31667bf95d8429eae519ba41ac5773a.pdf?index=trueIn PDF document text
    • http://vexabimumemig.atwebpages.com/excelsior_springs_community_center_trunk_or_treat.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_f9e28ead638745f48523cb29ded1230f.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_off00011905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11905 5116 bytes
SHA-256: 94a3292ce9568c6f6906def8a8176e86f3a1d8c8a393c44ba89b80861a7e2231
font_01_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 10576 bytes
SHA-256: d1f2a27c212097dfed57880a88db88bfa14ff48f3575efe1a7a88ad423b78090