Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cfa39ef5f31cb2…

MALICIOUS

PDF

74.8 KB Created: 2021-04-28 22:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f4c3c338ea455828ecc65077d2a39f9e SHA-1: 59fd221199c21dd55c9e1585dd91db1cba55b5a2 SHA-256: b8cfa39ef5f31cb2c94b11fa55740ccb7be1025cf96e33ab5c5a4fe37373da76
126 Risk Score

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://jacksth.ru/strik?utm_term=what+is+rationalist+theory PDF link annotation
    • http://zunololanuxigu.sportsontheweb.net/can_t_help_falling_in_love_ukulele_fingerstyle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_6036647fb0ba4.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/jgjdAib/dream_piano_music_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/ojcifvA/bapakumorinejeno.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/how_many_carbs_in_a_dunkin_egg_and_cheese_wrap.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/5840347820.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/manosukiruburekukoj.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/technical_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/seduregudire/ciajjSi/62748104163.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/wilmington_bible_study_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_5ff33a9a0f144.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/52646504349.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/remavuj/tilediwumaxutusopoturopi.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/96717213686.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/76269730281.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/77704018616.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/how-_to_guide_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/industrial_canning_process.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_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 4888 bytes
SHA-256: 45a061a6e91b4526856456de9bbddf4f715bfd1cb03bacdead8998097e2943b8
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 10180 bytes
SHA-256: 5e6f68930778fe242902f30cabe7df17e7f1ac64fe0e585c556e3a6301a76334