Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e3a6e82fac5700…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 15:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f45335870a7e620e1a76c61662c610d3 SHA-1: 8380f30364d0027c2e0fb4c37ed288e61fa8a1ad SHA-256: 85e3a6e82fac570028bb8592ebf776c712498961c905de6b49489369365ea953
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, including one pointing to a potentially malicious domain, suggests the document is part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is used to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614356c345cfe---36250545049.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614109ecba4d9---gezalebevoxidipuzix.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/dozosukojewogimemim.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/7711747842.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/17413881078.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/8589503221.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/kuwenopusapix.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/xikavelozodojuwedo.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/xebuzafitilarawov.pdfIn PDF document text
    • http://fxlcd.com/upload/file/14431997470.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/zonafewu.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/zodoserolelisi.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/68377027654.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/kikadabofenibituwimi.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/72612487326.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/zasaseninar.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/35612179.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/36532871946.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/50431330580.pdfIn PDF document text
    • http://com123.vn/uploads/file/rofepakiduvanununoz.pdfIn PDF document text
    • https://tigapilar.com/upload/files/48409844551.pdfIn PDF document text
    • http://newshop.jp/archive/file/difijitomenigatil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gangstar+vegas+world+of+crime+cheatsPDF 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_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 19928 bytes
SHA-256: c49660afe4f8e5c83d8f5b3eb4754da1517113e0aef57ede55992163a748a265
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 11116 bytes
SHA-256: 0eed69c2b88ddbfa1aa3dcb6b7d497fe3fe3b0527cf7d477c8ca952058eee717