Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd70edc0d1b6ca2…

MALICIOUS

PDF

73.5 KB Created: 2021-03-29 11:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 32d653b7da569f4b677ed7f2a00b9414 SHA-1: 8835011c7e3a86831249bc847fc3643733058781 SHA-256: 6bd70edc0d1b6ca262284def57fd726e2a8c996c7958cd9f7c0adf730420c233
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to book titles, likely to trick users into clicking the embedded URLs. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 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.
  • 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
  • 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/award?keyword=bsria+rules+of+thumb+4th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389353/normal_601d37dc5fde1.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/bjiragi/dio_magica_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/1heDha2/ridafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_60605d920a633.pdfIn PDF document text
    • http://goodsun.space/metodologia_de_la_investigacion_estado_del_arte5g1s8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_603ce9f60e6bf.pdfIn PDF document text
    • http://theporte.xyz/weber_spirit_ii_e-310_burner_tubesjw8l4.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/UAdigii/sadanandante_samayam_background_music.pdfIn PDF document text
    • http://metazoaapc.fun/mandated_reporter_training_online_free_paam6oe.pdfIn PDF document text
    • http://itfamily.info/jubizekobipaliunay.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/Dhegdia/outdoor_portable_tabletop_fire_pit.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/BQOfwhi/hide_and_seek_movie_online_with_english_subtitles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390664/normal_6005e9dfcf324.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/Chaxgf4/finders_keepers_full_movie_1984.pdfIn PDF document text
    • https://cdn.sqhk.co/felegabiw/qzIjePP/heart_healthy_diet_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/geku5gd/59656053565.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_15250a2bb215484095748e4503561fd7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/27386610267.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/maxuwepukanebekorupop.pdfIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_6486602832364dbf818920acf4711d52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/pifunajowagigugez.pdfIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_bd2b4a3ac5064656b1d013bfc76a5285.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_fe76b0cac32c46759b5a3d76ae644c97.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_9260c56c79ef4422aa38c519478caa95.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 5556 bytes
SHA-256: 762f412d18f02d98e47b3c8df83b2d30b2f85d1f16192d94e40b0e34120fd6d8

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