Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a35186dced906b…

MALICIOUS

PDF

80.3 KB Created: 2021-03-18 03:38:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 83bdd0b0ae047399fd0ea739e9c846b3 SHA-1: b0cad30ee1f3e9451c99ae8f25e096c7870d5f83 SHA-256: d9a35186dced906be220a4d851265c30ba2b00023dc77748c024d955ef222ba2
166 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, one of which is specifically crafted to download an APK file. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that the document may be a pretext for delivering a password-protected archive, which is a common tactic to bypass security filters. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wix?keyword=root+genius+latest+apk+download PDF link annotation
    • http://lapitubemexidi.mywebcommunity.org/homemade_wood_lathe_duplicator_plans.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/apostila_auditor_fiscal_tributrio_municipal.pdfIn PDF document text
    • http://mevesepegubisis.scienceontheweb.net/lithium_bromide_absorption_refrigeration_system.pdfIn PDF document text
    • http://finofubamu.mygamesonline.org/catalogo_de_productos_del_sat.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/how_to_clean_aroma_rice_cooker.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/rikijik.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/92518096959.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/free_1st_grade_printable_math_sheets.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/sex_education_season_3_release_date_countdown.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/soposuludap.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/55686332711.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/creative_writing_definition_and_examples.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/14212989995.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/34669785337.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/module_8_basic_aerodynamics_questions.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/48005291596.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://ligujizulogi.atwebpages.com/94083635114.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_3a24170b9a8446dfbcccbaf9f9869cec.pdf?index=trueIn PDF document text
    • http://nakeviw.myartsonline.com/febiwi.pdfIn PDF document text
    • http://vexolofifete.atwebpages.com/71981933097.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_c74af2502f854c8e87128301b7c8f7ab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 5076 bytes
SHA-256: cccda90639c6442f74180d5e4f247225f7374e35e5b45e3cc882d4237b38ea70
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 11236 bytes
SHA-256: 7ddab31f186828bd13608bbf263d8cd276fe40681a19e23eac21629ae103d67f
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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