Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d86f166ad82c778…

MALICIOUS

PDF

89.8 KB Created: 2021-04-06 19:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fd11c33e3b02a0791bea581a657f6abd SHA-1: 72ed4435d7bf3265fd4724cbce8e4b2fccf67abd SHA-256: 1d86f166ad82c778c7204436db4f09685c6b17aa89cbfdd4f9a30caf181c10b7
134 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=persona+3+fes+guide+reddit PDF link annotation
    • http://kofibilo.22web.org/ignou_admission_form.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/gfgfLT6/bemagaridotizunodovurawe.pdfIn PDF document text
    • http://futegejetebe.22web.org/biology_book_class_10.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/mrityunjay_book_in_gujarati.pdfIn PDF document text
    • http://pizimiwubavip.iblogger.org/writing_academic_english_book.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/beginner_gym_workout_plan.pdfIn PDF document text
    • http://wazumitizun.22web.org/48851329044.pdfIn PDF document text
    • http://labozozirakeko.22web.org/32203707562.pdfIn PDF document text
    • http://lemoxovuv.22web.org/siraxo.pdfIn PDF document text
    • http://jovumelikas.22web.org/advanced_and_multivariate_statistical_methods_mertler.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/jaZJiai/zowutudidatakotufewa.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tijiwef.epizy.com/hepatology_journals_case_reports.pdfIn PDF document text
    • http://galikunulumofi.epizy.com/sopezolulimumurof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b0ab7e-0683-4a0a-ab98-c5d82f399dd2/sonic_frozen_drinks_calories.pdfIn PDF document text
    • http://dimesagir.epizy.com/lineman_and_cableman_handbook.pdfIn PDF document text
    • http://warijagivekivax.rf.gd/you_are_responsible_for_your_own_happiness_on_the_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faac302f-085f-4118-9820-df0db27c1d09/78411960167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126c3d9f-748e-4b5b-8cd1-55f3c1cadb71/percent_composition_practice_worksheet_with_answers.pdfIn PDF document text
    • http://fetevatakipip.epizy.com/secondary_school_chemistry_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6b6cb0-fb16-4f6d-a3d3-6d1d0210418f/ranalepagilasadez.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 1584 bytes
SHA-256: 0bb11703b7dc1baa056079491f56e703297c1bc1312d66473e04fd16578cfb97
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 5208 bytes
SHA-256: 841e1f58b0530ba64c91553cfd5366cf1920c625e7a6aa8e4644209c0bd6a698
font_02_sfnt_off00011586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11586 14596 bytes
SHA-256: 606dbf45e5e58a14c65eafaf790123507a0190f3a949d2a403da92198049075b
font_03_sfnt_off000144da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 16060 bytes
SHA-256: 530f01482eeb5277fe65be8fcca13843e55396bd91e2ba1cc8ff1cc279efb2ef