Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f40da6a640087e5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-20 00:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4756fc621de3db60ce049f53e2de0770 SHA-1: 67a680e782bc6b238c74afce43628cabddfae086 SHA-256: 9f40da6a640087e54bcfaadcd7c180d6bf6b26ea81f797eb989bf1023e714fa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or unknown domains. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings suggest a lure to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sanchariglobal.com/userfiles/file/vaxini.pdf In PDF document text
    • http://mebizstekla.ru/userfiles/file/23234722340.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/ruvozalixevigapa.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/46806195612.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xotozufa.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/67086105010.pdfIn PDF document text
    • https://techlan.pl/files/file/tubixomedofevidegadalowe.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd19facfde---zojoxuvifoluriza.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/vafajulenofo.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/15860332472.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/77261266595.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/47504614809.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/legudinixorusesega.pdfIn PDF document text
    • http://dakov.hu/_user/file/38212442789.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/tesovonu.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/80959798303.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gezanagukapupedono.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/tonebasat.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/lisemufojulusujifigetibik.pdfIn PDF document text
    • http://opersan.com/file/zifodoxi.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/31976090945.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/69388350483.pdfIn PDF document text
    • http://lamay.de/userfiles/file/vigubane.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/jokarebobusadebimuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fb+video+download+free+apkPDF 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_off0000c0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AB 10584 bytes
SHA-256: 60c562688f3ae176c7582e92a49a2c2af04b078a56813c8207663a71e12a624f
font_01_sfnt_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 18752 bytes
SHA-256: 70000f124a460e7d303a64878da370ed02ca9cde92a7c6c40cd03a226c0202da
font_02_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1