Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc22cb06e57604d…

MALICIOUS

PDF

111.4 KB Created: 2021-09-19 14:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b9e19aaf9b56d7a3bf228efa3737bff SHA-1: bf4c86126d41caecaf064b6b3a29675eed89d65b SHA-256: 2bc22cb06e57604df43df642767080d836a9a762a4a01ecff035fb015da24f64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm on disposable hosting, pointing towards a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://munnarteabungalows.com/userfiles/file/xajebusiki.pdf In PDF document text
    • http://ryanoomen.nl/uploadimages/files/kufegej.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/69178123111.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/rufixadudefovaxudo.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/91254535186.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/51993101744.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/muzidejawuduzirew.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/kinixudamavek.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/31472656948.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/64981305481.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wesemopipuwagidat.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/87914639642.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/820hone6862o3ct0lrlm9jlqa7/mesenokopomiguniwifiko.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/pekezezivasosap.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/jufararesu.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210915140545.pdfIn PDF document text
    • http://health-bridge.in/upload/file/libebewifufogog.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/90165210534.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vawogesiden.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/96535898127.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913082440.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/79480593455.pdfIn PDF document text
    • https://granitnet.hu/editor_up/14466216621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=napoleon+hill+think+and+grow+rich+book+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 26656 bytes
SHA-256: e1b68bec49b755ffc542d16c95ea56f1c6fcd5de2c7b946391b387bf8e18814f
font_02_sfnt_off0001746c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1746C 11028 bytes
SHA-256: 25c7da19216bc67ce52f87125b438074421d2df9f6f9aa125bd18e49564567a5
font_03_sfnt_off00018d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8E 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off00019585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19585 16932 bytes
SHA-256: 6a3c37ab44b8236c3f810d452075b81776c86915b221fcbf4353a831ff34be17