Malicious PDF — malware analysis report

Static analysis result for SHA-256 2afbf5a64903e785…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 22:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c20256756b36ebd321abb2a4bb852b84 SHA-1: 8830ee595ccca705dc9bae35c72f4fd6ecae5239 SHA-256: 2afbf5a64903e785a6a5c29b5f09b27246a5b2fb38e6a380cfca5bbb227f18ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://brava-ekb.ru/userfiles/file/73582561402.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614236f716b85---pegubofazejujaba.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/77456614450.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/18791513706.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613efc1d53035---nukesigefopito.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/1827102786.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/10944835476.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/sanomasum.pdfIn PDF document text
    • https://rubfila.in/files/file/norifi.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/sogevewipedo.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/jemotuvexonegekug.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/74645222264.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/rabikifimupevixopod.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/madijinozogekari.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/kenobavijax.pdfIn PDF document text
    • http://vhktn.at/images/content/files/15725674092.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/84779131425.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/88676214358.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/36326904920.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/gowitusifa.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/livumoxubokegafutezikig.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/43520483743.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/80856682261.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/96982391742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kyte+tv+apkPDF 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_off0000c232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC232 9880 bytes
SHA-256: 1adb4ad7fcd52785ec7d3dc303fe9c792cfd2c5c8627b4d6343d745945d73e15
font_01_sfnt_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 21004 bytes
SHA-256: e8000ffae2f2b83e6bf46df3309be22bd76935dd68bec705ffbdb0aa5681d8b2