Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcb25490799306d…

MALICIOUS

PDF

75.3 KB Created: 2021-03-28 05:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42a4dbd39e389cde8fa6739f274c0454 SHA-1: 70d94162797b0d052b29a3ab535af2be2256f79f SHA-256: efcb25490799306d01c2ebf9f491caec84f94d00b0112064e5fb470ab8724293
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 0.9996

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=school+assessment+coordinator+job+description PDF link annotation
    • https://cdn.sqhk.co/sosexazefip/jcjigcd/mejigemumibejozuse.pdfIn PDF document text
    • https://cdn.sqhk.co/ximirujusuxo/gWhcDZH/i_wish_i_could_english_grammar.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/95491061403.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/e979xhb/basketball_stars_unblocked_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wegabunuti/pEgjge2/vazupudobomitetatodovuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/n537Whc/rowuwu.pdfIn PDF document text
    • http://fitatuvepejozo.sportsontheweb.net/madifavelelefip.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/aYjcTij/82979265882.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/92160878469.pdfIn PDF document text
    • https://cdn.sqhk.co/samojusive/ggghihs/31209867602.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/iakgggi/folder_cover_design_template_free.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/diagnosis_of_acute_coronary_syndrome.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/raxirozonelaw.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/giIMhgR/knife_dash_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_bb21dcb8e4ed4cc985627497ce2d38b5.pdf?index=trueIn PDF document text
    • http://desovizipelo.onlinewebshop.net/buku_panduan_akreditasi_puskesmas.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/to_kill_a_mockingbird_packet_questions.pdfIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_f59d2b0649f2481789c1b8a32d71db48.pdf?index=trueIn PDF document text
    • http://donijexufenu.onlinewebshop.net/susibibasinegoziwawas.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/non_governmental_organisations_in_zimbabwe.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_9139ae9e5f414ef7991ad97a8b868ed9.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_d2a2872e12204dc39e1c012e9426e4e7.pdf?index=trueIn 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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 5632 bytes
SHA-256: b20b799413c6a9505f04146a0f1c375239abe828848ad502a832592ddaf3d369
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 10840 bytes
SHA-256: dcabf11fb314e6871d8afbe544f30eca734d3fc7256f374252783880287f768e

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