Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67fe2a262b74b3c…

MALICIOUS

PDF

75.0 KB Created: 2021-03-10 01:31:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 273eefe4caa6d65cd3486f361d973928 SHA-1: 351cef232f0cc42a1643e28eb12eb62ead072631 SHA-256: a67fe2a262b74b3c5c5b944351f54b2766c05f3f625ed7e7db9368476465e972
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 0.9993

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://baarspo.ru/strik?utm_term=clasificacion+de+las+cuentas+contables+de+contabilidad PDF link annotation
    • http://vexetifiridik.mypressonline.com/husky_120v_inflator_review.pdfIn PDF document text
    • http://jakor.pro/manualidades_para_nios_palitos_de_helado8ozea.pdfIn PDF document text
    • http://kukushka.space/tipos_de_tijeras_quirurgicass2zes.pdfIn PDF document text
    • http://pinegrvuig.fun/anime_soundboard_mod_apk75jnp.pdfIn PDF document text
    • http://chambreop.xyz/spoken_english_course_near_megzqo4.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/gofuranadewujoxevuv.pdfIn PDF document text
    • http://xbet1.fun/vuruzixulikj5zmm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fe7fa6-e6ea-46c7-864e-d3ae816e7b66/how_to_best_prepare_for_interview_questions.pdfIn PDF document text
    • http://gupatevefojip.myartsonline.com/zavexeranujofij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47d4f679-6422-406a-90ee-9d1bd9a4fa63/3993660094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d921648-f667-4f57-bc5d-2f3af53a46fd/mike_myers_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e0ae4d-09a1-4c4e-85f0-9653da23bc54/63835069520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27984502-a954-4884-b9c8-13c46b2ecd41/zaxaleketoxaresav.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/rich_dad_poor_dad_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7451b31-79a6-4201-b8b6-e02d70402fe5/free_propresenter_backgrounds_downloads.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/environmental_pollution_journal_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/sakojifuruluvudajagok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e69c9d-4380-4ef6-81ff-5c5125bc9570/how_to_cook_brownies_in_pampered_chef_brownie_pan.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/46912199517.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/tcc_tecnologia_da_informao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321d75c3-85a1-46a4-b7fb-97c6b9ce268b/weider_pro_9940_exercise_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db39e903-0d9d-4e8e-8632-db0aecf87680/how_to_influence_others_and_make_friends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f0f478-07fa-4067-bd75-7d1557ebd0d7/ruvixanojetomoda.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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 4964 bytes
SHA-256: 51f600c86187f30b9d61bf23a35110a8eefa964a3294646c313bbf79137c9fbf
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 11808 bytes
SHA-256: 90ac22970e489b9a23dce58c45b6cb17d755a462851bfe955184f5589f8c71c5