Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96a4ed20352a0a3…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 01:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b6307c9aee30a573c82733379c2193b SHA-1: c3da556f2994c3ed5c5cf8927115331be426279d SHA-256: a96a4ed20352a0a374caf1834aca719fc036984c45c7011eb97076833721309c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with a phishing attack or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://corpus.bg/files/fck/file/mamasepo.pdf In PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/databeni.pdfIn PDF document text
    • http://mutitar.com/user_img/files/fizosotamowu.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/23205071834.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/59986983437.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/92739921603.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/xetonoku.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/fivakagix.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pufuk.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/75587813121.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/82337284849.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/99995449528.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06ad79dc8---bivanogisexipuxivofama.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/35240870908.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/pofaso.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/bigetogigefinujotizupopej.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134cce758dde---sorifezasevamivunere.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/puwufexizobukurezamu.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/48310231504.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/62178809092.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/zobeze.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/xokiwavuzoravobibe.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/74426003884.pdfIn PDF document text
    • http://annabarons.com/files/files/lirifufobito.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/86507334075.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/dederaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fort+craft+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_off0000c898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 10000 bytes
SHA-256: 3f5d88c4ab8ea1dc0e61020b1658e3caf27ac2860abb3f9bf46ff052729a6942
font_02_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 17520 bytes
SHA-256: 60940e364a9017d570c4b6d988dd469b989e2d2207aaca93b4aa7ec28d41b884