Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fefd2574731ee72…

MALICIOUS

PDF

78.5 KB Created: 2021-04-30 18:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c4de8f603057cd46eae9162db543c94 SHA-1: b0fa237aea4497fd71e98b2363291cd2f75c77b9 SHA-256: 9fefd2574731ee721ef417cde107ab84d4df1f0f5ec38dd82dbce7e62c925609
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://zajinet.ru/strik?utm_term=snap+on+solus+pro+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419623/normal_5fc999ef282c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_60133f59f159b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_601d12c771dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449001/normal_6040d6f67506a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_601178cb84d18.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/qFgg9gg/cabify_es_legal_en_colombia_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/iajbjiQ/switch_lite_colors_comparison.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460690/normal_5ff4f14432ea7.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/69iaggp/facebook_lite_login_account_download_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_6062c6e86a9b8.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/cijzuhg/cubes_math_strategy_free_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/ZgejijJ/17071663557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_60599d6cb1396.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukavazoxa.epizy.com/karamovawigefemoxu.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/eureka_easyclean_corded_handheld_vacuum_71c.pdfIn PDF document text
    • http://lufixov.epizy.com/vilewapenow.pdfIn PDF document text
    • http://rukukuwozar.epizy.com/buenas_tardes_en_ingles_informal.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/dyson_dc25_blocked_wand.pdfIn PDF document text
    • http://rejizupufuxetib.rf.gd/srimad_bhagavatam_book.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_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 5068 bytes
SHA-256: 520d34a372b6884b7b39cb8a0ad54ec503d2e3421199faf88abfbbdcbc9967dc
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 11292 bytes
SHA-256: d70cc9a759d18915029a703f42fd9cf6e6780b8c2af928dc5a00d61a86380e42

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