Malicious PDF — malware analysis report

Static analysis result for SHA-256 02764a62680f58da…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 20:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1aeaabf52fcc30cd65196f38221e4fe6 SHA-1: 4802306d5535a3865d3b38e05365c6fe0f967c19 SHA-256: 02764a62680f58da01930121e620aa7a764d0326beb4bac55a3a18ff8d026134
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The 'SE_MFA_LURE' heuristic indicates it's designed for credential harvesting by impersonating multi-factor authentication prompts. The embedded JavaScript stream and numerous external URIs, many pointing to suspicious PDF files on potentially disposable domains, support this phishing and credential theft objective. The file likely uses these links to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://mingmitrcoffee.com/user_img/files/53203254397.pdf In PDF document text
    • http://gld-lining.com/user_img/files/3882884647.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/6487777433.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e82f3e1137---sunexasatikidogosogi.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/tugobiputalovigakug.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/24499876983.pdfIn PDF document text
    • http://ruihuitax.com/files/file/70346399764.pdfIn PDF document text
    • https://bagstyle.uz/images/file/sajowezalogopodowenelefut.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/tujekawazadopozu.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/62896031504.pdfIn PDF document text
    • https://33mobility.net/uploads/files/toguzavegewomalupude.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jogalurexexe.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/72229549000.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/muvenarotonarakoriziposo.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/xexud.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/bifaz.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/tuwebemereb.pdfIn PDF document text
    • http://bibonatura.com/ckfinder/userfiles/files/zugolo.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/bonujagukigezajurapoba.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/sonaxovafokumodivib.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/74892693455.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/70756215009.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/32844556367.pdfIn PDF document text
    • https://windsbs.biz/files/file/susakuputesisuzizakisivux.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/xizenenaliwafajalozapawog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=movie+movies+app+for+androidPDF 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_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 17164 bytes
SHA-256: 5f7622c3fc0f39f846dcce77e869c6172e47d4f36f20e92818276d83a2f3e5b2
font_01_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 10572 bytes
SHA-256: 49b907c875c53ac38400e8e504e0cb71dcb315542b15ef9fdaf87bdf1644f428
font_02_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1