Malicious PDF — malware analysis report

Static analysis result for SHA-256 8246ac1784926c1f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 16:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9b663eade8664d9e09e1eaff029b30f SHA-1: b8198c30e5702423eab519849ea736230dc6b9d3 SHA-256: 8246ac1784926c1f5971889a2b8f7232740236e8bac9686c6b2e1438e02247cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://ncdesign.it/userfiles/files/dokos.pdf In PDF document text
    • http://patrickstaxi.fr/userfiles/file/89989469217.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/3555309220.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/7659780903.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/pekaduwajewamizipo.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/dagitiridi.pdfIn PDF document text
    • http://orthopediedelft.eu/files/53712728532.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/57991758539.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/78521876865.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/43761116293.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/makase.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/munamukoxujorerenedobu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f682c3648---43449561990.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210908_065600_7153.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/54430872027.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/kafapodelu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1b09d5b5---8168834568.pdfIn PDF document text
    • https://webaprint.be/img/file/68023153994.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/58731394984.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/xazewomarekesil.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/linup.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/gepovanukoseruzukozepi.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/4206073224.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/bedaniloruxujevumavezid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=does+the+iphone+se+second+generation+have+live+wallpaperPDF 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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 10944 bytes
SHA-256: a62a4b18786d808ccdee8f1be91f8c4f3e64dc83d1ce082f086a968cc9a8435e
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 17860 bytes
SHA-256: e0724761c7ae6745e1e36c000e7d289844c5c8a87947a7cd2b53054db4171351
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1