Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b39f0eebc5a771…

MALICIOUS

PDF

86.6 KB Created: 2021-04-05 15:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1c623a12c2b1a47e12139e560d093906 SHA-1: 75b2de4af68df2ca904538ba32e0880b14eea079 SHA-256: b2b39f0eebc5a771a3a77fa4472f98f653e5d7be6516c15202152a2e79163bd0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/award?keyword=concave+and+convex+polygons+worksheet+pdf PDF link annotation
    • https://xuxerativizujaf.weebly.com/uploads/1/3/1/0/131070719/gadamonefotojaw.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/88533049614.pdfIn PDF document text
    • http://jefigesawek.iblogger.org/acute_tubular_necrosis.pdfIn PDF document text
    • https://lixepugoguzezum.weebly.com/uploads/1/3/4/1/134132265/eb55b240d2509.pdfIn PDF document text
    • https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/7264199.pdfIn PDF document text
    • http://futigovu.scienceontheweb.net/dunebikuxegapexib.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/hdZjiaE/magento_2_email_templates_translate.pdfIn PDF document text
    • https://nuxilovu.weebly.com/uploads/1/3/4/4/134479446/viduwe_tobumoj_vuxamana_naxiwir.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/toporezijozatogad.pdfIn PDF document text
    • https://kakadolaronenun.weebly.com/uploads/1/3/3/9/133997154/remagotanozoket_sivegu.pdfIn PDF document text
    • https://basuxebuj.weebly.com/uploads/1/3/1/3/131379820/neneradosipepur_lojigobumeviris.pdfIn PDF document text
    • https://cdn.sqhk.co/gifidupuzuv/nLuSMwc/musica_gratis_apple.pdfIn PDF document text
    • http://gonakasuzoze.22web.org/95655953090.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/5d345f690fcd015.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/WidZie2/rexuloweb.pdfIn PDF document text
    • https://xaporavuxeboj.weebly.com/uploads/1/3/2/6/132695407/1770746.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/riredavofabavunob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voruluju.epizy.com/madumuxinubamajejew.pdfIn PDF document text
    • http://bimumebuzof.epizy.com/update_app_android_java.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/how_to_report_hazing_in_the_marine_corps.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/gibag.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 5708 bytes
SHA-256: 64e4b8c0b807c8c51d6bbfc4acc6240e9fedb7c446cbfb7180d1f53d5ccfb505
font_01_sfnt_off0001107c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107C 11408 bytes
SHA-256: 51ff9e616bf8bf6b5d0c2e253bbd3ecc59b3c960d6b3bf8ef3b57415cd313c0d
font_02_sfnt_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1