Malicious PDF — malware analysis report

Static analysis result for SHA-256 44602f9cbecb5158…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 04:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69017a74e508515b0b8180cedb15db2d SHA-1: 51e29f8d87a4e7eb44277c1a152bcf87ca58af7b SHA-256: 44602f9cbecb5158dad8f4bcdc33c123fd93116839e53b2913f9eb728c7cdf4c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the PDF is designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://helices-evra.com/userfiles/file/josefaporikusasuvoviw.pdf In PDF document text
    • http://kmjmt.com/news/upload/file/210912084812148586cpnzol.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484b510583d---24642792793.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/rewerawitusulusi.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/vijuzilibojifa.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/tikugalarowasumugosu.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/duzuvivatujos.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/86878555270.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/34524439986.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/8731039136.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/dulow.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/37770022389.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/fisitesafusojimoxuloj.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/74492345948.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/39465904640.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/87469631174.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/binoxafuk.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/7918283351.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/46706855090.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/tewobifukamuluvefito.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/ganaf.pdfIn PDF document text
    • https://rubfila.in/files/file/wejavigofawunamujiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fastboot+rom+downloadPDF 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_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 18788 bytes
SHA-256: d1a0264da165a8100560bae410d3a8c88448787990ac9cdb732a7f5b40e0b066
font_02_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 10388 bytes
SHA-256: f73ce6e5e856e310f6380960e9370c2ef4f2b1f6eed19829f6fb370e3f7183f3