Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfc15a055ea0b31…

MALICIOUS

PDF

81.9 KB Created: 2021-03-10 04:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3749f21b362ea7a56ce6132663d52192 SHA-1: 659e5cbfaccfc89b7ab5440c87e44aca194d61dc SHA-256: bdfc15a055ea0b31fc2a72803ddd625e2e7e933c481a033232c5c178646da50a
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://vilenefex.ru/award?keyword=aquiles+y+la+tortuga+pdf PDF link annotation
    • http://servisvds.ru/pekujafavelulajim8iibm.pdfIn PDF document text
    • http://zoomita.space/twilight_eclipse_2010_full_movie_in_hindi_free_download0osiv.pdfIn PDF document text
    • http://forkidsshop.online/sumegetijuvizusaxurelouzf99.pdfIn PDF document text
    • http://kudijajipiwi.iblogger.org/digozoxab.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/f4d5ee8.pdfIn PDF document text
    • http://edayafar.xyz/faire_un_compte_rendu_de_tp2bzfu.pdfIn PDF document text
    • http://bestcreditcheck.info/what_are_some_examples_of_deviancebn4lv.pdfIn PDF document text
    • http://starkrobotics.org/lekawurezawojo3r9l4.pdfIn PDF document text
    • http://dutov.org/84532278617m2046.pdfIn PDF document text
    • http://yoga-fitness.space/archery_store_salem_oregon77tjd.pdfIn PDF document text
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/resugarerol.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/60979389820exe30.pdfIn PDF document text
    • http://okrasote.info/malaxag22ep2.pdfIn PDF document text
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/zaxenux_vekeluwekera_tewiredat_xefijilev.pdfIn PDF document text
    • http://esplus.pro/how_to_make_the_assassins_creed_hidden_blade1fecj.pdfIn PDF document text
    • http://lg-copyright.com/wamolamujexufilibixagegoza7orv.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/43004978230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokigabexotuk.rf.gd/baldwin_letter_to_my_nephew.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/a_court_of_thorns_and_roses_book_1_summary.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_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 5428 bytes
SHA-256: cf84fc796b9e50d81cb95d99b0663b144323d7cde344de4bbd7c3e916e6a93f8
font_01_sfnt_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 11752 bytes
SHA-256: 77558027f549aec3dbd7506129d16b67ea8a76092d57375173f42152c61ef171
font_02_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 16204 bytes
SHA-256: 66bacf5d175b63a09a1289c51a67289a07f13d1787ad2fa70df7cca4ba05e6df