Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b035920b3f6dfc9…

MALICIOUS

PDF

78.6 KB Created: 2021-03-30 08:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 85d8f5a025e042aecbef8e44fd4ef382 SHA-1: 51911ba80576491829d084848c2b18bb0b25e807 SHA-256: 4b035920b3f6dfc95503a143347bf0410e37817c47dfe44c57319ebf318525a1
156 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 0.9996

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=tronical+tuning+system+review PDF link annotation
    • https://zerorobasajegi.weebly.com/uploads/1/3/4/7/134751736/572c09c033c.pdfIn PDF document text
    • http://whysmall.space/370409234495xhew.pdfIn PDF document text
    • http://stroiline74.ru/top_40_christian_songs_2019_playlist2fx4v.pdfIn PDF document text
    • http://help-violation.com/related_studies_about_academic_performance_of_students_with_ofw_parents267gh.pdfIn PDF document text
    • http://okclub.org/how_fast_is_a_v6_chargereixaf.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/xovewijonowe-guvuj-ginolejarinabit.pdfIn PDF document text
    • http://euroshopme.site/61564291700a9ld9.pdfIn PDF document text
    • https://zefurevexas.weebly.com/uploads/1/3/5/3/135399706/gabewivusipak-jumifim-womavemaj.pdfIn PDF document text
    • http://reweder.site/brother_xl2600i_needle_threaderqdd1y.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/char-broil_tru-infrared_electric_patio_bistro_240_reviewsp07jp.pdfIn PDF document text
    • http://vkrowl.com/bible_commentary_on_matthew_6_22_23m2xkz.pdfIn PDF document text
    • http://vanlit.ru/hunger_games_book_1_chapter_1tr2mo.pdfIn PDF document text
    • http://iuts.space/febiduzizifokajemikk5p4m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gofiguj/10433469409.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/does_ductless_air_conditioning_increase_home_value.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/83984688453.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/2000_ford_ranger_4x4_wheel_bolt_pattern.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/castle_ravenloft_map_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/purpose_driven_life_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/kereladinixowo.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/do_kitchenaid_mixers_need_maintenance.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/37863657794.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_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 5324 bytes
SHA-256: 9216e7eb850c5039e5cce117b03a792a4fc6178242752b8747dc4b7baf0ee9b8
font_01_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 11024 bytes
SHA-256: 3a3d1c35862b6c1b9a1d5a0da53d70565c03dd942e914d4e9f3151d3c8381ff0

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