Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb921876598792b…

MALICIOUS

PDF

73.1 KB Created: 2021-03-30 10:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fe11e65c8efaf911a7286b1933109d99 SHA-1: eed98cb81c3e93ab9009f9a98026589ae9ceeb88 SHA-256: 2fb921876598792bc9c5a926dfa37d2a7ee71bbfd62cfdf591789153cced52b2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The document body, though heavily obfuscated, contains keywords related to puzzles, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=geometry+crossword+puzzle+wordmint+answers PDF link annotation
    • https://cdn.sqhk.co/ponesigis/54WDhb8/42378929357.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/ghjwYWI/dragon_quest_dai_no_daibouken_2020_opening.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/nemexixamizuboridizelosob.pdfIn PDF document text
    • http://supusatode.sportsontheweb.net/concrete_nouns_list_a_z.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/blackmagic_intensity_pro_installation.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/pukokifirefu.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/P0WZEic/tovugezira.pdfIn PDF document text
    • http://kodepovorivapi.mygamesonline.org/30059792398.pdfIn PDF document text
    • http://wekanisa.scienceontheweb.net/affidavit_format_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a080f3ed-a732-4c52-9279-12fd25365a1c/cien_aos_de_soledad_frases_famosas.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/amazer_u_lock_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff860903-426c-42d6-9b53-f41e19416d1c/different_types_of_informational_text_structures.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/iron_deficiency_anemia_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/kotidipivafefimelir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb5acde-3590-488c-a2f2-9e527f417f7b/40875860288.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/padakusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e877627-43f5-4d8f-ba7d-b6cd64dce9e7/zufipaxasev.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/un_tranvia_llamado_deseo_online.pdfIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/segidivevevidefabepatujuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3415b498-3262-49f1-8fdd-808d298af933/zezawevifijoxaze.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_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 5492 bytes
SHA-256: bf3a4828012bb49845a12ce28b18a4fce42fa8198369dd6f0dbbd62d0303bbef
font_01_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 10444 bytes
SHA-256: ee6914dcdff8bb4fb3a9f6919078612a5d85444e18e944646e337ab5a9aecce9

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