Malicious PDF — malware analysis report

Static analysis result for SHA-256 03458f76f93ffd7b…

MALICIOUS

PDF

71.5 KB Created: 2021-04-05 14:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eeaae9887264a73d75b09013ea3f7511 SHA-1: d024089ee7035bf24aced89de8660aece0f9f20d SHA-256: 03458f76f93ffd7bde253f9041ff66a7457d49446ce2c0bb367ad58a5c3232f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://leonvi.ru/wix?keyword=fitness+for+10+mankato PDF link annotation
    • http://vewosanexifusip.22web.org/miwexokaguva.pdfIn PDF document text
    • http://robinmani.site/fekovufijoxezipyv5.pdfIn PDF document text
    • http://heliusdesign.ru/51064113554dndbf.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/nugago.pdfIn PDF document text
    • https://cdn.sqhk.co/toliximozupa/Rk8ihyf/ihc_test_report_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/idifUQ9/duet_definition_literature.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/66956029143.pdfIn PDF document text
    • http://sajitalunaded.22web.org/28087018123.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/eid3zih/wooden_rabbit_castle_australia.pdfIn PDF document text
    • http://ladyso.ru/surikiguwixegegifmn17.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/ggdf0if/cars_and_bids_hoovies_garage.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://uploads.strikinglycdn.com/files/0748e3f8-c8b8-46d3-8a53-beb4c16ada0b/samsung_55_inch_smart_tv_6500_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7051e74-140b-4c37-8433-eecea426ce92/junot_diaz_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50152f71-5af3-4453-9f61-aad5df640630/synonyms_list_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/nodoxedamukaseziremelato.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/calculus_half_life_problems_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873db088-6b27-4d18-b137-985b21e7df5e/batunesepomama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b43bfb-a972-46fe-906a-4644605cdc08/wesawufevoloxaso.pdfIn PDF document text
    • http://nedizilunok.myartsonline.com/general_aptitude_questions_answers_free_download.pdfIn PDF document text
    • http://nilezowavegat.rf.gd/chick_fil_a_grilled_chicken_protein_style.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_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 4884 bytes
SHA-256: 2cc8e93f3dfd5c09c4ec52fd2e1992c63db1dffb8c69f997d64294097f864921
font_01_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 10908 bytes
SHA-256: dd4e786f0d0fb22e5872dff5675884a79bbdebe20651fb94203b3312948c7468
font_02_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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