Malicious PDF — malware analysis report

Static analysis result for SHA-256 8924fa7becca2f78…

MALICIOUS

PDF

82.7 KB Created: 2021-03-17 04:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 567baed72089c2a5ac21a5fbfd94ba82 SHA-1: 74960b39ed16bdc172e3d0e1fb780575cbb3404a SHA-256: 8924fa7becca2f7817b34b2e07e14834316f33bcc75c2b849734756724b3f75e
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 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=integral+of+2x+cos+x PDF link annotation
    • http://lnstagramcopyrighthelps.com/kakivevz6k.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/livro_ansiedade_augusto.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/vitamix_e320_costco_in_store.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/2382009898.pdfIn PDF document text
    • http://wibagimapo.22web.org/camscanner_app_for_jio_phone.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/xumagorosul.pdfIn PDF document text
    • http://appless.space/gowiveriz75ifo.pdfIn PDF document text
    • http://zhigina.ru/24197793760nug1t.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/brachytherapy_sources.pdfIn PDF document text
    • http://firstdoctor.xyz/budurimo19f51.pdfIn PDF document text
    • http://vesimawamom.66ghz.com/21328518778.pdfIn PDF document text
    • http://rewetuxavix.mypressonline.com/how_to_connect_brother_printer_hl-1110.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/2652731608.pdfIn PDF document text
    • http://kelnoteres.xyz/microsoft_office_2016_tutorial_free_downloadga8uu.pdfIn PDF document text
    • http://kzrovk.xyz/pa_uc_tax_ratea5x0a.pdfIn PDF document text
    • http://bio-ita.fun/cambridge_english_practice_testssara2.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/vonutavekip/39808378899.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/19751960232.pdfIn PDF document text
    • http://simagofuzod.epizy.com/fatepisuduwikin.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/rumegid.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/carol_of_the_bells_piano_accompaniment.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/how_to_shut_off_rainbird_5000_sprinkler_head.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/chatham_county_jail_inmate_release_information.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 5184 bytes
SHA-256: 2c6802d5d7dec145a81d12548fb2c70a7815756ab673ff57befd688b17936fa6
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 11696 bytes
SHA-256: 713308c4014386edffff2bd088dd94ed395724e3ae37879105bbecf57f1fd90e
font_02_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 16080 bytes
SHA-256: e3d583ca8131484f6b7e9991674a220a85ec8466745261d702706f92b0246cac

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