Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c79936764ce9a82…

MALICIOUS

PDF

70.7 KB Created: 2021-03-01 11:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f27864b176601d6c52f8cdaeedd916ce SHA-1: 738a581efde4aae06e69b6974c9873401e8db95b SHA-256: 4c79936764ce9a822b62f8e6b16b835d1f315da7d3fe06aeb08aa2a47b05c6b1
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 0.9998

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://vilenefex.ru/wix?keyword=network+broadway+tickets+on+sale PDF link annotation
    • http://mon-compte-cmb.best/ativador_pacote_office_2010xyrat.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/britax_marathon_clicktight_car_seat_installation.pdfIn PDF document text
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/8541020.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/misery_book_ending_explained.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/ernakulam_weather_report_today.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/qfigjeg/kakao_friends_ryan_baby_pillow.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/2d5356dbb5f.pdfIn PDF document text
    • https://fabofosozani.weebly.com/uploads/1/3/4/8/134870462/16287b308fd6b0.pdfIn PDF document text
    • http://policyhelpcenter.com/sleepwalking_bring_me_the_horizonhraru.pdfIn PDF document text
    • http://prizinsta365.website/domestic_animals_worksheetsst07y.pdfIn PDF document text
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/wuvoronuxisom.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/NajdBgc/81526374207.pdfIn PDF document text
    • https://noxigizafovezad.weebly.com/uploads/1/3/1/4/131438329/7860174.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/pireg.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/6747523412.pdfIn PDF document text
    • https://mojebope.weebly.com/uploads/1/3/4/6/134609081/2265874.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litorow.myartsonline.com/english_verb_list_with_spanish_translation.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 5300 bytes
SHA-256: f0dd870ce219a6c9ebdd7901607be70a97ba1086341c54df91ed3e63b1d16251
font_01_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 10036 bytes
SHA-256: 15ff51bca40720b77b93fb4db780afc9eb81885b1eed9ffe33012e6967fe383f

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