Malicious PDF — malware analysis report

Static analysis result for SHA-256 df58e65623e99a1d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 08:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a0f4853cf3629b9bf717ca485617655c SHA-1: 4069e62ec2a1e4975f4ad7047f5e239cabc04040 SHA-256: df58e65623e99a1d267bb43aff2579f16e741f80eb3675c62cdd5080e7c33470
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a potential phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://rpdev.org/ckfinder/userfiles/files/wapazegawalufalukere.pdf In PDF document text
    • https://iskoruma.com/upload/ckfinder/files/98731033135.pdfIn PDF document text
    • http://plncse.hu/php_data/file/damomowukixokiwukagibonun.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631919203_56b09f2821.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/bovukutewapivamuzipuropo.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/tamafamidekasalanibeka.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/28262307259.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/15382911560.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/73275429349.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/dekadekowef.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/96676397614.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/gigulomumiwafajas.pdfIn PDF document text
    • http://profstil.az/userfiles/file/93834980728.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/lewirumekogoxewosimujiwo.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/21717384598.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210917_C7B7A3123F19EF2F.pdfIn PDF document text
    • http://vaynhe.com/upload/files/jepimitazeridegexaneno.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/30011461440.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4f2214b5c---ximulelixumedos.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/47828788836.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/jurore.pdfIn PDF document text
    • http://etre-belle.su/images/file/xukuxiv.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/93927271793.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca97bbfbe3---93187851977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chrome+translate+page+to+englishPDF 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_off0000b3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 10732 bytes
SHA-256: 479f7a7d702f72043e65b8a16f681e9c47f939728d8d87bcb7e12b5df475b6d7
font_01_sfnt_off0000cc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 17892 bytes
SHA-256: 57b8cb769d11e27a4a51f696dd2b7d9b4f867a06d9fd337384d19d102e3d363e
font_02_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1