Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea9a9261d49569d…

MALICIOUS

PDF

70.9 KB Created: 2021-04-05 04:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 726e81e9dddc95b812ac934322709b4c SHA-1: 9141892db15e1ccb437641622eebe6fdca7a77d2 SHA-256: 0ea9a9261d49569d1bdd0a0fd99e2d3dedd89034b140620c59c1b1452c5c0fc1
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://baarspo.ru/strik?utm_term=uk+abg+normal+values PDF link annotation
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/xisolijiwusegiku.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/WgjWShi/princess_full_body_spa_salon_madison.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/jdhjjeF/earn_to_die_unblocked_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/hephcc7/slither_movie_stream_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/gcrZhaS/69110556852.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/6933017.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/37ie8gg/wijatexarinivino.pdfIn PDF document text
    • http://bakimebisuxoj.iblogger.org/riesgos_biologicos_laborales.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/cvfaxFU/46345770045.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
    • https://s3.amazonaws.com/fovezewi/58989733472.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/hotstar_vip_new_app.pdfIn PDF document text
    • http://luxepiluwi.epizy.com/free_product_comparison_chart_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/battery_tender_for_motorcycle.pdfIn PDF document text
    • http://zimipasazodid.rf.gd/taketawabuxawovisuvadobu.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/44476989218.pdfIn PDF document text
    • http://bulufuw.rf.gd/become_eco_friendly_journal_assignment.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/25941857208.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/make_avr_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/liwigagakixobonujub.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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 5016 bytes
SHA-256: 7fe05f0b2c5c8814d3b3f11986571722f351abcd645f5ee1a1c3320b1509e3b7
font_01_sfnt_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 10720 bytes
SHA-256: 88626af53907e6d5f640f5db22c6217a4fa1747fb2e015c71e6d26636f421169
font_02_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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