Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e4b4637d941dd6…

MALICIOUS

PDF

79.5 KB Created: 2021-03-12 01:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8c9108d26df54f93aa5c0e4e64cfccb8 SHA-1: 62bc9b1f49d061223fca6c7316ec67b7c4293d59 SHA-256: 43e4b4637d941dd64e4fa9b6e94973779423c787b8840992deb4681ddd9967a1
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-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://botokaw.ru/123?utm_term=analysis+of+incomplete+multivariate+data+pdf PDF link annotation
    • http://hangookoil.ru/53691109155svqn0.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/los_angeles_city_map.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/totikam.pdfIn PDF document text
    • http://zespodsvetkoy.site/887279943235or5l.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/jjbjdW2/54117286334.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/eLKihih/how_to_beat_carnival_game_ball_toss.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/built_in_furniture.pdfIn PDF document text
    • http://migerov.xyz/what_is_the_relationship_between_height_and_shoe_size_correlateloqzl.pdfIn PDF document text
    • https://cdn.sqhk.co/lofopapenow/aVgcLSx/small_alphabet_letters_tracing_worksheets.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/1146884956.pdfIn PDF document text
    • http://hookup668.site/sesomanosezefepekidakds8r1.pdfIn PDF document text
    • http://malespw.xyz/monstrous_pizza_covina_menun2ut7.pdfIn PDF document text
    • http://eushopvmn.site/sony_handycam_dcr_dvd108_manualdapoz.pdfIn PDF document text
    • http://ueuniti.xyz/belililesimu3euxz.pdfIn PDF document text
    • http://telunodet.22web.org/chinnari_chinnari_chiluka_song_mp4.pdfIn PDF document text
    • http://kraftmann.su/90910785578vxi21.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/how_to_write_an_art_installation_proposal.pdfIn PDF document text
    • https://cdn.sqhk.co/kupuruvew/2qOjfsG/kevegupalajosoxeli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://majikujiva.epizy.com/writing_effective_sentences_ppt.pdfIn PDF document text
    • http://jikusona.rf.gd/pofapetaxesafeboxa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 5336 bytes
SHA-256: a56ae3b19beaa2ecbe27012f3b6ccd2ddac40243bf4ed57a88d9a907c0c63977
font_01_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 10644 bytes
SHA-256: fe1c14ba397e955f01d5dc9a9cc0b24ab6e2f8737e6ae2a267755f6775d02ab8
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3