Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3166b8723d6634a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 12:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d270fbfaa4d4a0f7748cafd6298944b6 SHA-1: 1ac9509c992a88d2674518bc225570547b774eda SHA-256: a3166b8723d6634a3620b53e1ca0d5945058bcda7ae7b86251366bf461f2a98c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phishing content. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://greenbins.ca/ckfinder/userfiles/files/mezebuxipavefoxezo.pdf In PDF document text
    • http://gardatrans.com/content/Files/50694304908.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210920_025321_121.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ed69c609f---86967968264.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/43938401661.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/40475616214.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/xemanavalugasavowevajexis.pdfIn PDF document text
    • https://rotitelor.com/contents/files/xerivomediniduj.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/jejejeritovodogegoturawub.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/xuzesamofafilidivofufa.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/12511869972.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/defuneju.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/96729526631.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/lubugenarogotavunigite.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/nuwezuwifetasarewaz.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/37888646356.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/09d9b7bb18c8c92aa02b9acf05ada292/43176420727.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/voxitogoj.pdfIn PDF document text
    • https://phunhai.net/upload/files/folalutafesawopilaxisedur.pdfIn PDF document text
    • https://svltv.in/userfiles/files/fewulode.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/madupu.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/82163887399.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/48876262788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=360+video+player+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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 17268 bytes
SHA-256: 5ef464c4d9bc2fec40e8d1155886467257cdce064d28b72de8201a878b0ad1d7
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 10664 bytes
SHA-256: 4042de0fd82d65d9ee54f4a726f6060f1d5c3eb8dcfcb7e735bd70c8bda69a1f

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