Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e9f16131afe198…

MALICIOUS

PDF

72.6 KB Created: 2021-02-24 19:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 54eaca0a72186a0716ecdef44434edb6 SHA-1: e47fcd28c6766137cec3efc3ff8591894a34f0e9 SHA-256: c0e9f16131afe198715bfa2f3dc861175ff3681bdbacd3c50837c5ee4a7b8bc8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm designed to redirect users. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

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://jacksth.ru/123?utm_term=precio+del+libro+etica+para+amador PDF link annotation
    • http://gakagebir.mypressonline.com/average_salary_for_graphic_designer_in_chicago.pdfIn PDF document text
    • http://punejew.mygamesonline.org/kixijorubulidot.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/ecjBhjV/difepe.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/vinubapiwojimosarapuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369782/normal_600404845d302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_6021448067f89.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/AghIjgh/61620532490.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/jeiahjT/bugsy_from_bedtime_stories_with_glasses.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/ijiOn42/knife_block_walmart.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/star_wars_galaxy_of_adventures_ahsoka_tano_figure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kalumewuvo.rf.gd/how_often_should_you_use_paper_shredder_lubricant_sheets.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/1080p_video_er_tamil.pdfIn PDF document text
    • http://tunawibiga.rf.gd/xovisodezuwelufebixafuve.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/how_to_stretch_for_plantar_fasciitis.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/89548353986.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/akinator_apk_android_2._3.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_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 4864 bytes
SHA-256: a8a2c1d986653623d19710e7e7a731ad9c2003dc9f94248f6352fa22d59588bc
font_01_sfnt_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 11236 bytes
SHA-256: 58e76544d75f459635119a83838543ebc83b8058cc5b5dd0942973210448f0c5
font_02_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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