Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac32ff344d536abf…

MALICIOUS

PDF

76.5 KB Created: 2021-04-01 01:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b1449aefe60e75d6f1fb240ce3fb5d7d SHA-1: 98dcc959baccbc3f2a61b5e13eb07a508a7bcf77 SHA-256: ac32ff344d536abf8429f76f9b248d31316185483de8dda1f80926a94bf003ae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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://dafemum.ru/strik?utm_term=what%2527s+a+positive+word+that+starts+with+e PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368246/normal_6055f74037f51.pdfIn PDF document text
    • http://buloshnaya.site/budukaboxoboxutixczzvx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fd85c83506d5.pdfIn PDF document text
    • http://ritual-venki.online/the_pirate_fairy_2014_in_hindi_download6pif7.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/oxford_discover_3_teacher_s_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/aSgfBha/lugidufugezi.pdfIn PDF document text
    • https://cdn.sqhk.co/tobepeliv/jbh1kie/shoot_the_rope_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_600f05beb3542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd319d3e70d9.pdfIn PDF document text
    • https://cdn.sqhk.co/tewigoju/lgdQSVS/fishbone_ishikawa_template.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/nick_foles_wife_sicktfalm.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/how_to_find_income_summary_accounting.pdfIn PDF document text
    • https://cdn.sqhk.co/lopovekis/igghjbb/bncc_ensino_fundamental_anos_finais_em.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_5ff8f1f7d05b1.pdfIn PDF document text
    • http://socialwave.me/ludusexjkef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fe89ea05e303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b42102b-2a1c-4bb3-a1ef-f014c0c28106/76875516635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282fc660-efe5-4ab8-bfa8-7857ca400853/film_script_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a408fca-589a-42ab-81be-3cf5d4263c99/what_type_of_juice_for_mimosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119974e4-614b-4d40-afb4-84b178b560b9/what_were_the_different_plans_for_reconstruction.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_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 5212 bytes
SHA-256: da12b17812bb231a1b33fdf09776e0f56b91c87f6753df95308c4963fc10423c
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 9960 bytes
SHA-256: 39e34e53f7d42511cf778e28e10ca92855db76706a2842bb249781e282285a9e

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