Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd7072107f2e76f…

MALICIOUS

PDF

80.4 KB Created: 2021-03-02 05:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 90118e70d2051e75ef3de0de1c036333 SHA-1: b08aa470232d4a4b70642222b63ad0da20e69635 SHA-256: 4cd7072107f2e76f81f1d902b77d201b68ea122054930865a187c916b4a721df
126 Risk Score

Malware Insights

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

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 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://ponafet.ru/123?utm_term=what+to+eat+21+day+sugar+detox PDF link annotation
    • http://deutschebank-meine.com/cargoloc_crossbars_fit_guideooqce.pdfIn PDF document text
    • https://cdn.sqhk.co/libarazituw/fPBhdWF/vofulibugopijo.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/hbZggJm/xtreme_soaring_3d_pc.pdfIn PDF document text
    • http://ejqy.com/build_battle_craftlandiakn2tu.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/vesutuxejenepajesaveseved.pdfIn PDF document text
    • http://tortomsk.ru/schwinn_570u_upright_exercise_bike_reviews1q6zr.pdfIn PDF document text
    • http://copyright-help-report.com/97884258493r5cc8.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/beicjbH/iron_maiden_legacy_of_the_beast_toronto_setlist.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/diary_of_a_wimpy_kid_dog_days_book_review.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/ttulos_de_crdito_direito_empresarial.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/55510506631.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/how_karst_landscapes_are_formed.pdfIn PDF document text
    • https://cdn.sqhk.co/piwizogir/ebifjcc/46669687001.pdfIn PDF document text
    • http://detelibizonibi.22web.org/how_to_do_step_4_fear_inventory.pdfIn PDF document text
    • http://itslm.fun/25811337579svj7h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujamaxopubisa.rf.gd/zadul.pdfIn PDF document text
    • http://wawutanow.epizy.com/futabakedigewijonirumu.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_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 5424 bytes
SHA-256: 08ce093a622aea8d890a7d88fff2c9f6601791a46bede4f5f0f8db8ce676fa21
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 11424 bytes
SHA-256: ee39bd1c91ec74d0117bdc9efbda77ce9915af6303af75a272202968be77073b

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