Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e7631abf732c6c…

MALICIOUS

PDF

89.1 KB Created: 2021-09-10 12:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 290bbbc65ae5366aa6660d666df8f985 SHA-1: 4d806a2313e999c94e4948f99c8e9323cc8ebda0 SHA-256: 63e7631abf732c6cb190f2e8de5f1c38f17016252c13fae5b5a290533c904337
166 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating a browser extension installation lure. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content or visiting phishing sites. The presence of numerous distinct hosts in the PDF's link farm further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://caratow.nl/userfiles/file/ritodakenaramib.pdf In PDF document text
    • http://cancercareresearch.com/userfiles/file/suvam.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/78723686398.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091009520273499.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/welibodamo.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/xovelirilagej.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/74293297552.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/51911892593.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/jixom.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/tidaboburikadi.pdfIn PDF document text
    • https://vpmemorial.net/images/file/kurizigelizotiz.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/48122746220.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/sevorofezupaziwujipiwum.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/60513295208.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tenujopetafibak.pdfIn PDF document text
    • https://artenika.pl/fck/file/sururivapaf.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/winularipakigujedar.pdfIn PDF document text
    • http://timocomputer.cz/files/file/jumuturozuragexovegenozox.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/rudolivuxerenemozubi.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/63070718134.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/runez.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/wivivetenamuxus.pdfIn PDF document text
    • http://schokofontaenen.de/idata/72544989481.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/99901048436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=where+can+i+find+apk+files+on+my+phonePDF 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_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 10984 bytes
SHA-256: 1b14bd2c0181ec1d57b36ef846a1fe130c761f133a3ac8dabd7ab7dcb0be1550
font_01_sfnt_off00010c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 19456 bytes
SHA-256: e9961563a394bacb67b28fb575ed9984af018cd3f3b2c5e3a9eb52cfaa00a988
font_02_sfnt_off00013eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1