Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fc13d178ef4da6…

MALICIOUS

PDF

86.4 KB Created: 2021-09-14 11:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69f878fadd6f092a9d5467c3f01f1912 SHA-1: 0b9e544d30f8dddbbf1bb82e6f8fb0e165ec2e0d SHA-256: d0fc13d178ef4da6fae33a6da033f4cffc8f6df29f1f6146beda48f57f157ed3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs pointing to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a malicious intent to distribute content or manipulate search engine results. While no scripts were extracted, the structure and URL distribution strongly suggest a malicious document designed to lure users to other potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://abwalabamaave.com/uploads/files/wavikufokure.pdf In PDF document text
    • http://tnslib.tools/userfiles/files/gotawara.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/63637335662.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/27202622605.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/66355023262.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/batozopalurikiduvofo.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/85489584639.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/zusefimuvit.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109140428366413.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/94385799167.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f637899029---66968017424.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/govigotufibomujuramoza.pdfIn PDF document text
    • http://wych123.com/upload/files/85151170833.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/90601782548.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/pesenexatosufojutesuma.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/60134435751.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/bivalekufowiwewaxadafep.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/sinitupotafuvexajaf.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/mefidebajud.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/dilikuzakisivugese.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/53962338512.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/biranenu.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/dadenodakosalitira.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/mifuvuxogamoxej.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/warajokisus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=yts+tagalog+moviesPDF 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_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 19156 bytes
SHA-256: aa7c62a425c3b27cc021e347e610b10fe8e9605e5e98a50802f8e6c605a3c797
font_01_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 10296 bytes
SHA-256: bd5f3f9a959e95e6beea9e491973d3e8eba51c17d29b6ab1f24ce9ac32fc3682