Malicious PDF — malware analysis report

Static analysis result for SHA-256 9880f1487dc88951…

MALICIOUS

PDF

73.5 KB Created: 2021-04-09 04:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c229212a8339f95abc0060d0bd7a293e SHA-1: 5c6c93814301f93f5f7ba6ed17cb49dbb7d79b4b SHA-256: 9880f1487dc889517a2f693362f2c07b250f9ce9fc74cd093a18a1d82d1ef8e3
66 Risk Score

Malware Insights

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

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 0.9999

Heuristics 4

  • 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://midufefew.ru/strik?utm_term=char-broil+medallion+electric+smoker+reviews PDF link annotation
    • http://triple-doska4.club/yqjh3.pdfIn PDF document text
    • http://lovechat24.club/how_much_does_it_cost_to_send_a_30_pound_packagedtr7q.pdfIn PDF document text
    • http://getbuiss.online/bhagalpur_ka_station_1_number_platformumwf8.pdfIn PDF document text
    • http://1xbet-registrat.site/53846069651jwpx8.pdfIn PDF document text
    • http://aarbuz.space/mp_bsc_bed_application_form_2019ipac5.pdfIn PDF document text
    • http://koprovk.xyz/the_choice_2020_watch_onlineqc209.pdfIn PDF document text
    • http://businessmentality.com/rokiniivmre.pdfIn PDF document text
    • http://x-bionic.shop/2851678037052u0z.pdfIn PDF document text
    • http://mesretly.xyz/is_there_going_to_be_a_princess_diaries_threedieub.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://healthyforczechrepublic.site/226034728700hcrd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/wesirovuromozudasurar.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_6b7ce9fff0054017a0248b61ed3b109f.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_5befb7efdcd74153b2c9d752dbbe088d.pdf?index=trueIn PDF document text
    • https://5a840009-9758-4786-9341-86142d54ca6e.filesusr.com/ugd/3254bf_675dd039099a4b1b892e931948bd2c9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/resistance_exercise_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/pokalewenuvikoganukibani.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/gaspar_sanz_canarios.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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 5472 bytes
SHA-256: 412fc46694afbf4b8825c7abad59dac29907e80445758209fb03872dcbd84885
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 12632 bytes
SHA-256: e27aca81da15b79ede5497376b8ef9c8d4b2820b64deb82dfe7bf20e0255ac0e

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