Malicious PDF — malware analysis report

Static analysis result for SHA-256 7423731b411dfea1…

MALICIOUS

PDF

93.7 KB Created: 2021-04-02 16:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 600c249f39ff526bb0cfbba60fac1eb0 SHA-1: 11ae525182e705a24f73091bb573729327d25143 SHA-256: 7423731b411dfea14a1ade5e67cd3bd2f45be017376f7f696cf6bd5176ccf174
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 0.9996

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://soxebez.ru/123?utm_term=news+reporter+dies+age+27 PDF link annotation
    • http://fusekimutoxi.sportsontheweb.net/lixalubovufizuwudimawexon.pdfIn PDF document text
    • https://cdn.sqhk.co/duwutawuna/a5W2iae/24987729341.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuwanuvadi/chalvhd/fokutubaridurenibo.pdfIn PDF document text
    • https://cdn.sqhk.co/fufejapopunu/dgdrshg/dangmattsmith_funny_kid_test_answers_part_5.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/dajarododer.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/jchwzHb/xudevapurulirug.pdfIn PDF document text
    • http://triple-doska4.club/badger_1_garbage_disposal_not_workingxj5cs.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/nThgvna/nisegoju.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/iCMjdz7/61676167463.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/ggigcA3/kingdom_of_procreation_2_apk.pdfIn PDF document text
    • http://good-production16.site/rugufofad7p240.pdfIn PDF document text
    • http://axecheat1.xyz/lm358_op_amp_data_sheetn7ghm.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/43109282366.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/Bhhhg2F/one_piece_treasure_cruise_best_strength_characters.pdfIn PDF document text
    • http://zuvels.xyz/ndis_consumables_guide_2019aw630.pdfIn PDF document text
    • http://tersq.space/54448362856ryav5.pdfIn PDF document text
    • http://rawokixe.22web.org/brunnstrom_stages_of_recovery.pdfIn PDF document text
    • https://cdn.sqhk.co/lebexuzo/m6mJOhi/go_kart_go_ultra_online.pdfIn PDF document text
    • http://dronextactical.xyz/21894700785om9hk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lewutiv.epizy.com/girl_online_characters_list.pdfIn PDF document text
    • http://taribizuka.epizy.com/pfsense_firewall_rules.pdfIn PDF document text
    • http://dutataratoboruj.rf.gd/2046165518.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_off00012fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAB 5368 bytes
SHA-256: 38e5544a32cb091980c655218fee3e63ce2afe85046c3289de90ef07b8ced338
font_01_sfnt_off0001421e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 11564 bytes
SHA-256: 8477acbacc75e36454b8a070edf7ab22c7c283a0a9f94ddfb6616aca64c29802

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