Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9ff9f61b1b8d0c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 21:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4eeb9d80679d2c971152c184c72c986 SHA-1: 0b487c550dd0d9cb431106c7642442e1ad3985c6 SHA-256: 7e9ff9f61b1b8d0cd3c567098d8db588c758acd2957bcd5f553f7871926ccc79
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm hosted on disposable domains. ClamAV detection and ML classification further indicate malicious intent. The primary attack pattern involves directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gonganmi.com/userfiles/file/64932916802.pdf In PDF document text
    • http://heydarbaba.org/resimler/files/22921008238.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/gabawe.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/gazuravi.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/60791901166.pdfIn PDF document text
    • http://iphysiology.ru/upload/34189959421.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/4690265221.pdfIn PDF document text
    • https://eslms.com/userfiles/file/61040860057.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/41846748997.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/ninejegawekaxagujuxiz.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/redojedanurodeges.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/wafibe.pdfIn PDF document text
    • https://electroagro.es/pub/files/61005863133.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f307656fc0---gikosiwato.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210917083117.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/piburixikonopap.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/wotizimupujud.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/wukuwesalunaxefa.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/ruzomuzofa.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/98148463153.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/40638062448.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/51173811152.pdfIn PDF document text
    • http://talleresjpg.es/img/file/97453540025.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/sarewugimi.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/64933000920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+can+i+recover+deleted+sms+from+my+phonePDF 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_off0000b355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 11140 bytes
SHA-256: f686848bd1d3844d3b980d53e060a4895f39e31509058b308d3278c4fa17fdb0
font_01_sfnt_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 16872 bytes
SHA-256: 3d97008a913b6f3f87babdb105ddd7d989e007a6d3e6094b394780fc030eb63d
font_02_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1