Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2270215ca0ab79…

MALICIOUS

PDF

86.3 KB Created: 2021-09-15 13:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b57d55fda877c816870a88a46a85f608 SHA-1: a3b189a6bae4e651e5cab7e0437ea0fa6a358d6e SHA-256: fb2270215ca0ab79d7a66d23615f4d4fab855e05811bc670b7d3577377b65dbd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://avukatwebsitesi.trakyasoft.com/upload/files/badeg.pdf In PDF document text
    • http://grgct.com/ckfinder/userfiles/files/dekusaladawobofub.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/depiwosa.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/benaziz.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/6590448936.pdfIn PDF document text
    • https://linker.tw/files/10782529415.pdfIn PDF document text
    • http://santabruna.cl/upload/file/jafin.pdfIn PDF document text
    • https://inks.bg/userfiles/file/xapuluxetitukovowalukosid.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/53639545994.pdfIn PDF document text
    • http://acril.ru/ufiles/files/62232710530.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/vqqfjobticn61fdgv5ghldskbm/walinovisuxonukujupatolo.pdfIn PDF document text
    • http://showpelec.com/data/file/20210912_065120_649.pdfIn PDF document text
    • http://cissi.it/userfiles/files/legosi.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kibape.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/42197476877.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/22511234674.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/74815982850.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/76102322762.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/6470100163.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/xizebesajenaremas.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/leguwijejozodulorefe.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a53128d3d5---zatuvowigovajan.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/63736472059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=birds+of+prey+moviePDF link annotation
    • 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://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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 10484 bytes
SHA-256: 17d537b88a2cc52715ec8da5e3659aaed1571408b7795e6f0cae50f828801113
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 19604 bytes
SHA-256: e44cfcbd8c6703a3687f6d4abfd7d204029e16bedd9cec987b1f270b2ba3735d
font_02_sfnt_off000133d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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