Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e074c8115f5b965…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 23:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55e0b9ebf9d675623d817eea144787f7 SHA-1: a4be8fe95e735d2e479c39d1b795b3b4dd7ad8b2 SHA-256: 8e074c8115f5b965ae91febba3283a51ceee307fe7c42a52889e465f59f68887
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, and one heuristic specifically identified it as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery. The wkhtmltopdf authoring application is unusual for typical user-generated documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://lawyerupsmart.com/tempimg/file/fevez.pdf In PDF document text
    • http://compsult.net/userfiles/file/defijukabevafagobewi.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/putuwew.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/50514014416.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/tibuna.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/furikeleralose.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/71137897894.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/tuwib.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/lufopugijagibilurafeku.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/niganiwuwipomudefufiz.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/851d35237c26a7a7f19253787f9125c9/xupegegowekimot.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/44619647404.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/71468969320.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/tazire.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/31507388076.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/50588384590.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/pekojekukogupadowowuj.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/janarojekonoki.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/14040959061.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/77518373289.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c77903f72---89467703694.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/galuxagatisuva.pdfIn PDF document text
    • http://come2menorca.com/images/file/tazisezeguvad.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_082731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=asphalt+9+game+download+play+storePDF 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_off0000af63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 11096 bytes
SHA-256: b8ac73b8f338f21f78c161e4f732f008e466597d02f093690e2e39a9bf1b80f7
font_02_sfnt_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 16704 bytes
SHA-256: 52f7db3863650a9305a6977079531b8ebef9929449b245e70db3747fe00756b7