Malicious PDF — malware analysis report

Static analysis result for SHA-256 b919966c1040d889…

MALICIOUS

PDF

89.6 KB Created: 2021-05-23 03:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3d191b2b0a29bb3cb20eecc6d1765e03 SHA-1: 1e070458aa6c71cdf35d02f75eea21269636e28e SHA-256: b919966c1040d8890e3fb3d34abef8a09b94f2f925297962d2ea08567601d7d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9990

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=how+to+use+voltalert+1ac-e+ii PDF link annotation
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/razekem.pdfIn PDF document text
    • https://midejewafefo.weebly.com/uploads/1/3/4/0/134000268/14b4084c791e0.pdfIn PDF document text
    • https://bomupafevusoze.weebly.com/uploads/1/3/1/4/131407549/df840ef8f38917.pdfIn PDF document text
    • https://guxevelanitab.weebly.com/uploads/1/3/4/7/134769418/kekame-koxubi-zusomaj.pdfIn PDF document text
    • https://fuzonigeli.weebly.com/uploads/1/3/0/8/130813785/vedevujewotox_zaranamokux.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/nexofez_wibuf_zelel_veriziv.pdfIn PDF document text
    • https://wadodimimilupe.weebly.com/uploads/1/3/0/8/130873890/fa834551ddd.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/nikemik.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/vakawaloxitapugavufi.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/36569944858.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/20045596701.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/7_habitos_de_la_gente_altamente_efectiva_stephen_r_covey_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/96922040268.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/kandh_tapke_babbu_maan_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/how_to_disassemble_a_roper_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/64472486914.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/what_are_the_first_3_cubed_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/verudelukowesozesuzevog.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/68774776782.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/bible_good_news_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/detrimental_impact_on_performance_flexible_working.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/gabokalaxiboze.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/64179935552.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_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 2632 bytes
SHA-256: 9e2a322c1f2f0d2a802ce1b492a75713d33f0a782fee27b56dae8e4773bef2f3
font_01_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 4988 bytes
SHA-256: f9ab7814b957aff25bbf6fadf619938fd0730f931a712db82f603566cd6964ff
font_02_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 12284 bytes
SHA-256: 97c28b23983ab62051d02ace8831474846445428d0110aec8992b36d9dd2d65d

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