Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f69b1c9923a34d2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 17:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d7c837a0da8520ac1607edd3db47232 SHA-1: 102e8a22f334cdf2af31455d6875128dfa60eb5d SHA-256: 0f69b1c9923a34d29183d2cc7d2f85b33214b68f72c388fcedcd3ceb0256f1ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including one pointing to 'infrive.ru', suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and the presence of JavaScript point towards an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=asphalt+9+system+req+android PDF link annotation
    • http://www.vljainandco.com/userfiles/files/16076105969.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab0fb639c1---mewoxajupabikevoxuzisomot.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/6140976367.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_D1CA5F81D64103C9.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/5698167374.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/91858419979.pdfIn PDF document text
    • https://svltv.in/userfiles/files/74554454487.pdfIn PDF document text
    • https://chineseclothingonline.com/File/59756432846.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/21661340913.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/fekikax.pdfIn PDF document text
    • http://scro.ru/pic/file/49945657865.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/26607275055.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/nigetowetesapanuxunetof.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/pudumixawopanow.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/tolalirepajenaga.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/31776435226.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210904_7DAD66C7DE7C1DCA.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210912044245_24uthu.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/pogurefowofuronogan.pdfIn PDF document text
    • http://metall-press.ru/files/51014849575.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/finegedowadududes.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/1067100424.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/nokokapenepivijotumopelaf.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/vuzorajedadebefefoxexege.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_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 11064 bytes
SHA-256: 9dcc08621dfb6ec541c1e9ff6c18c49b09db7b3ae7442eb980e604495b989d8a
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 17792 bytes
SHA-256: 5287cfa87725c756718bca8484a7c8360ad4bdd7de32304845fb2b12d6f018e5
font_02_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1