Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f76f33bcc7838e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 00:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49d264f3ff399cff737c9b5d70da10e0 SHA-1: b6ebcf96ee24ff5ee0a57fb0b0e8212057bc4e80 SHA-256: d9f76f33bcc7838e507bd6d7a6d8909e57fd76c78ae73bf2db13d5c874a1174e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the nature of the URLs and the ML classification suggest the PDF is intended to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/34912198284.pdf In PDF document text
    • http://chinalabware.ru/d/files/pisilabutasironazamopibog.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/rabijozetavefawav.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/sawojosanelerebitevuk.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/jebofajuj.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/kemizigil.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/69582864219.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/faxixawegog.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/91321900260.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/69590938307.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/fiwokabisag.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/83906791380.pdfIn PDF document text
    • http://espokebar.com/uploads/files/80422584542.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/vosadivabowakanavo.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/jubupipiw.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/wejubekodisikutasukexurel.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/39016523266.pdfIn PDF document text
    • https://andhimazhai.com/images/files/4771659887.pdfIn PDF document text
    • http://artediapharma.com/upload/files/23517965382.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/dezofabanalejukiniwof.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/64626058138.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/6372446834.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/50144184054.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/mebilifuparorew.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/etthd5rb9m5lhb051h1c7va488/91726313722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+x+and+y+nds+rom+zip+free+downloadPDF 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_off0000ba5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 17720 bytes
SHA-256: 5c9af238ff93ca2b08df1a3f7abf22042e9e0abd43eec9bbc50f8b5cb64e0cfb
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 11016 bytes
SHA-256: 76c2fa1cc4357e1335f28d05b4571cdab48e69ed026e6485d5146739cacd701b
font_02_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1