Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dd36291c5c0784…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 08:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c303b408a8be2c3214532065f76eeb6f SHA-1: 45b7f5768caad2721dce2924e64c2892c82cd9d7 SHA-256: c2dd36291c5c07842b72d937b7f37bc346cb6da32d6750bce1c5ac6472ee5cb7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malicious payloads. The 'Fake invoice / payment lure' heuristic further supports the idea that the document's content is intended to deceive the user into taking a harmful action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://nomylo.ru/uplcv?utm_term=gaap+accounting+standards+pdf PDF link annotation
    • https://interativacorretora.com/fotosempresa/files/kanubozozidutedima.pdfIn PDF document text
    • http://rrarental.org/upload/file/gopuzagoxinojekijojeje.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/52508499974.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/52813845270.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e315ceeb2bed97b976b9a3df5dd78927/suxekafowuzelivinoke.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3dbaf789---43364032343.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/sufodixodutuxigivoz.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/gesupopogefabewutuw.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/fivuxulamusobaboroxutem.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/dixeniboxolagevixipo.pdfIn PDF document text
    • http://mp-journal.com/media/file/5253654525.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/592117539.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/23775572476.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/nibimotuwo.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/navoveluvi.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090301232949.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/24177065665.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/fosekewaru.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejax.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/fafasedotutevibufepu.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/22647772819.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/tizegipobebulixotu.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/jikedanemufudezak.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/ziserimerusuv.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://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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 16336 bytes
SHA-256: 4dd8684a2e8ca37fa0ff21e1578127820dd27c8c609d2cc2ee9a020b7231f838
font_02_sfnt_off00011534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11534 10756 bytes
SHA-256: d8382da9a1529d51549a6bb321243ceb7240efb6dd2bdfd533181a07f8c55b0b