Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3cba69b2bbdba5…

MALICIOUS

PDF

75.6 KB Created: 2021-10-17 04:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1236cecd6900bf87cc213ebbe6bfa527 SHA-1: efab14b435691f97d513ae87ec05fcad6b8dde60 SHA-256: fe3cba69b2bbdba5276bb70e90aadc10d4d67ac229866acbd5b525a1a9efa9c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to malicious sites, as suggested by the numerous external URLs found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pistant.ru/uplcv?utm_term=grammatical+errors+are+indicated+with+a PDF link annotation
    • http://fencefactoryny.com/userfiles/file/53527636306.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/wadarizumularuragupam.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/53482759053.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/xomatewofawatog.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/kixonisukijipisuv.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/xalagedepen.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/gofiwituvuguzilegu.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/posoboxoxufafune.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/59598549466.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/51250947403.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/82375138529.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vo0npies1nbjkstt7t5kqh9bre/fezuzelipune.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/7208576874.pdfIn PDF document text
    • https://kueapem.com/contents/files/39407855687.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/1679475032.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/zobinoru.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/95167952642.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/30595691903.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/18618664300.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/luvovitas.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/76551695525.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/14493598686.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_off0000c401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 17156 bytes
SHA-256: af22d26c0d9489b28e8a8211761e2851df94939bbb6b853f9792c78a9d7ac2b9
font_02_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 10760 bytes
SHA-256: d715d1882948b46165fa99fce008415f1ea543034a17095b475f050e1a47c26d

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