Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66159122afc9836…

MALICIOUS

PDF

71.8 KB Created: 2021-02-16 20:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: bd21727239ff365c38d86b0b15f466b6 SHA-1: 140d7666706a4f008f63d0809d1c7249aada8a3a SHA-256: f66159122afc9836ceb2b2b238042ab8c4f358eb1bd52e46c7166cb5a844f03f
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 of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to obscure malicious destinations. The presence of external URIs and the 'link farm' heuristic indicate a strong likelihood of redirection to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=brother+hl-6180dw+toner+malaysia PDF link annotation
    • https://cdn.sqhk.co/rufebumu/5iehihb/52626648576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_6017fa16c7da8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_600662b31ca05.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/heb7Ejh/auto_gangster_hack_apk.pdfIn PDF document text
    • http://logvoz.ru/background_check_consent_formjr7xm.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/3b73764c3d.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/fixuwusunis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420245/normal_5fc83d69789aa.pdfIn PDF document text
    • http://gta-msk.ru/google_search_free_for_windows_10xh10r.pdfIn PDF document text
    • http://nerroba.info/free_bootstrap_admin_template_phpoauzg.pdfIn PDF document text
    • http://amst-watch-v1.club/41538031752aaaj3.pdfIn PDF document text
    • https://cdn.sqhk.co/valipovu/gcichbj/tuzuvubukisigago.pdfIn PDF document text
    • https://magirakikepemun.weebly.com/uploads/1/3/4/0/134000039/bb4c81c8c8b.pdfIn PDF document text
    • http://odemebayisitrafik.com/xubinugaluvimedesimyh06k.pdfIn PDF document text
    • http://dithetsen.xyz/ff8_dragon_fang_farmlqbj6.pdfIn PDF document text
    • http://pannochki-art.com/invisible_cities_italo_calvinovzsjo.pdfIn PDF document text
    • http://sberin.xyz/wututiwejodikelavuwubik9quf1.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/pumagef-setogon.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/hjDibrT/learn_thai_from_a_white_guy_login.pdfIn PDF document text
    • http://ingmijn.com/chargesheet_filed_in_498a21a90.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/xitukepapekuvug.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
    • https://s3.amazonaws.com/muxegeza/lakazoxefegikizomobiwudov.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/58828126006.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/yuvakbharati_marathi_11th_guide_new_syllabus.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_off0000cea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA4 5672 bytes
SHA-256: 09061c7e508ec897ca428061240f5110927c1318da47fb1a7cf392787ec581a3
font_01_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 10036 bytes
SHA-256: faafe31ce4fdfd09d1fa9bf70bf5ebf59f2fe039dc460013ac891c2d3274f12f
font_02_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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