Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f6bc554c5bc2bf…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 04:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c428d9ae269dc9702f04f25d39be4d39 SHA-1: 91817190c473c94401f85d7893e75a1d77debec1 SHA-256: 65f6bc554c5bc2bfbb0f9e015ce79fc9fa67f3dc0a732c8ca3e55b8bd0e56a52
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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 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.
  • 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://soxebez.ru/123?utm_term=binary+division+examples+pdf PDF link annotation
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/c5b70a42a3e1ee.pdfIn PDF document text
    • https://cdn.sqhk.co/gipudeviwapi/fhdBXji/circuit_electrique_interrupteur_lampe.pdfIn PDF document text
    • http://coolvdomaion.online/tefotgulx0.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/ePIgczz/28905609869.pdfIn PDF document text
    • http://nerroba.info/anbe_peranbu_ngk_video_song_masstamilanegnts.pdfIn PDF document text
    • https://cdn.sqhk.co/rawatajizefu/gijiTih/45599847943.pdfIn PDF document text
    • http://gufelujoziwuki.iblogger.org/jack_canfields_key_to_living_the_law_of_attraction_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/iiWAiaG/26229747968.pdfIn PDF document text
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/norasofo.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/gLzrhdt/xonefafipuga.pdfIn PDF document text
    • http://bomufofo.iblogger.org/how_to_boarding_pass_spicejet.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
    • http://fusifovizit.rf.gd/greeting_email_to_client_template.pdfIn PDF document text
    • http://lozunina.epizy.com/cbse_sample_paper_2020_class_12_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0f9e9d-4f4b-4ed9-b734-39bdc9e3a940/57424894963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76893d41-6273-47d0-8f24-55b6e615bd1a/battletech_technical_readout_succession_wars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fd6fdd-8e90-4a4b-baf5-ada2aea37b6f/plan_y_programa_de_estudios_2011_primer_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4bbff9-0916-42b4-b32b-5f5fd6d1a5bf/can_i_connect_goflex_home_directly_to_my_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f87201-2145-4f85-98cb-682eeeb92220/pekawixonom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c749c2c-6137-4377-8579-1bd65127cab9/49652398134.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5176 bytes
SHA-256: 8a9cb0732dd628e53451b2f82e3418928beb307f35546ff63d3d61006e956b86
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 10508 bytes
SHA-256: 87e113233f5def6698ff399119979c779a43015809e5045dd9680cb568fdb306
font_02_sfnt_off00012720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12720 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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