Malicious PDF — malware analysis report

Static analysis result for SHA-256 155aa47cd82fbac1…

MALICIOUS

PDF

69.2 KB Created: 2021-10-02 12:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3ed02cf479cffed54a608892983af51b SHA-1: fd270ddebd8f452d0b858d24765da8ae15f653ee SHA-256: 155aa47cd82fbac1e4b480d896d81a419b9acd960e58ecd9b345457f35a038c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://saopauloairporttransfers.com/ckfinder/userfiles/files/63693598146.pdf In PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/zimen.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/laniwavasupidobutub.pdfIn PDF document text
    • http://master-br.ru/img/file/tuxetifab.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/wofeza.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/gezurutozuz.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/63610160252.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/77608792253.pdfIn PDF document text
    • https://fitvital.hu/userfiles/files/releditapapu.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/tipakefutezasur.pdfIn PDF document text
    • https://0908108108.tw/upfile/files/2021/09/26/mosimikoxozowuxivamowi.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/83637881138.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/2527947842.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/jivupepaxozupuxovetoxubi.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/peparefuno.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/82670163554.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/puvog.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614216f393121---kawuzaf.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/xawafabexutujitem.pdfIn PDF document text
    • https://garmin10.ddbseven.cl/userfiles/file/18242002473.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/sovuxuduzavotorowuvomujo.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/tikosefofokesekasub.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/64617921062.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210922032924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cancellation+of+special+train+ticketsPDF 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_off0000b196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 14704 bytes
SHA-256: 34e6423995797e3150328e0fcfedffbf04c144fe85bf2839f71970143ecb8d10
font_02_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 10596 bytes
SHA-256: 953bcc0647d35f469a207a44d8ca2dc3da25599e725d9cc6d34a61c21896ce80