Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5d5bec20b54d88…

MALICIOUS

PDF

78.0 KB Created: 2021-03-25 13:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0bfef5f9b1fdd8f83cff07d6924288ac SHA-1: 100517e040c891aa1cfd3a8527ca740f97f17633 SHA-256: 7f5d5bec20b54d88cecbf55b6a01dba1777100d4da85143cf0bdceaf1c923248
186 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 0.9996

Heuristics 6

  • 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
  • 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/wix?keyword=modern+jazz+dance+videos PDF link annotation
    • http://bilomibedaralo.iblogger.org/unbiased_estimator_of_uniform_distribution.pdfIn PDF document text
    • http://pimidemo.iblogger.org/makerujofozomesosiraj.pdfIn PDF document text
    • https://juwememuju.weebly.com/uploads/1/3/4/5/134523402/8958031.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/14808650245.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/e3c032e9.pdfIn PDF document text
    • http://dowezujuzuzos.22web.org/acknowledgement_for_ojt_practicum_report.pdfIn PDF document text
    • https://poxosuliw.weebly.com/uploads/1/3/1/3/131383655/73a64be.pdfIn PDF document text
    • http://wigobike.sportsontheweb.net/accounting_information_systems_and_internal_control_2nd_edition.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/52012540017.pdfIn PDF document text
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/77af04759360.pdfIn PDF document text
    • http://wajuxerisowo.iblogger.org/wemufanuragowopivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeroguru/luguxiretuteledog.pdfIn PDF document text
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_8534f4ebd61c4e9bb66cd1a3d226f737.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_63a2094f11bd4d14b1eee315f59528cf.pdf?index=trueIn PDF document text
    • http://dupumimegijema.epizy.com/27057586608.pdfIn PDF document text
    • http://jepisaf.epizy.com/hallelujah_sheet_music_choir_free.pdfIn PDF document text
    • http://liwununigu.epizy.com/bevilegojopujugupanodizo.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/86589470106.pdfIn PDF document text
    • https://6dca1d0c-b102-4aa4-a312-d013f97c39dd.filesusr.com/ugd/fb87fb_219e19311b7e46cb99673b484045634f.pdf?index=trueIn PDF document text
    • http://gexawog.rf.gd/kepobajavo.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/free_last_version_of_whatsapp_plus.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_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 5092 bytes
SHA-256: 56c2c4df8c6c944bfab84838c9bece29d620b749b829b32f09f1c8f5c09200c1
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 11428 bytes
SHA-256: bbea8b485f89de3ac4e96a42b17ef3111ed1d42a855885cdadfd5af06d434c42

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