Malicious PDF — malware analysis report

Static analysis result for SHA-256 5033d3fb170e65d0…

MALICIOUS

PDF

78.4 KB Created: 2021-03-05 18:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 27cc22d73ecf80ee255f1f4a76fce866 SHA-1: 15ed3cc26be032e3145a5621111fc232e0950dc2 SHA-256: 5033d3fb170e65d09e5966ea7fa4e30bd528af0b5b18f7b397bf892b91d07265
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9993

Heuristics 5

  • 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://zajinet.ru/strik?utm_term=is+evening+primrose+oil+suitable+for+pregnancy PDF link annotation
    • https://cdn.sqhk.co/bitowiso/fqQ0eL0/xafotulomaregefi.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/hgjdjgr/minecraft_chernobyl_map_1._7._10.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/figgdgf/sell_kohl_s_gift_card_for_bitcoin.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/re8hgii/never_have_i_ever_imdb_trivia.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/TWLQta4/senudaguwapezav.pdfIn PDF document text
    • http://get3creditscores.info/mirebuxatimenut28un.pdfIn PDF document text
    • http://operationhomeplate.com/the_firm_nas_apple_musicryksy.pdfIn PDF document text
    • https://cdn.sqhk.co/xurakipigub/6oji2hj/98869764312.pdfIn PDF document text
    • http://golden-charm.ru/how_to_make_a_sock_puppet_step_by_stepa8m93.pdfIn PDF document text
    • http://soinjaga.ru/grayling_michigan_fishing_reportmfrj4.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/SBjficz/business_world_40_under_40_hr.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/hfIihij/veggie_ninja_game.pdfIn PDF document text
    • http://smartcreditscore.info/xogutizujoliluxexaworujuxioux.pdfIn PDF document text
    • http://mebel-albero.ru/zinugudivug1kfku.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/tggaIjg/ou_football_game_schedule_2020.pdfIn PDF document text
    • http://islandlandscapesbb.com/adeste_fideles_piano9z2je.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/gdicig5/final_fate_td_iosgods.pdfIn PDF document text
    • http://myirn.icu/center_tap_transformer_in_orcadh1dy0.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/gczzfha/smith_s_hours_of_operation.pdfIn PDF document text
    • http://persequenteamsohbet.com/bamezojilunavuturarijudd5j8b.pdfIn PDF document text
    • https://cdn.sqhk.co/pajubopolak/fZijpKN/802_e_front_st_plainfield_nj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_d19daa8410bf4c1990da06963ce83234.pdf?index=trueIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_524c7311fcac438e80834a25c28e762e.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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 5576 bytes
SHA-256: 629c3d6870b6a1b1bb48d77ae86baddb4e16d0df7f58c9923d4bf0efe9e166bb
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10180 bytes
SHA-256: d3148c68fc71297635380ac683f516422ac130affae96061cd19f0b38f8224d8

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