Malicious PDF — malware analysis report

Static analysis result for SHA-256 a087a14e28a1feb8…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 05:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d890d165c096b731014dd9038491e23 SHA-1: d788cd17aecfc780930c4e0ac00b0b7c54668051 SHA-256: a087a14e28a1feb844f0dfc5be24d501c75ee7cc0710e8f3674404a1b0955207
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aslplastic.com/ckfinder/userfiles/files/buralala.pdf In PDF document text
    • http://zulassungsdienst4you.de/bilder/file/domit.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/datakadudazesowu.pdfIn PDF document text
    • http://erex.hu/upload/file/2943282109.pdfIn PDF document text
    • https://ms1oke.com/contents/files/38578531441.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/020851386163.pdfIn PDF document text
    • http://koutingchina.com/upload/files/8292686050.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/22984221809.pdfIn PDF document text
    • http://wirheiraten.de/images/file/legoza.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/77658684109.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/33610615510.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613427e6e390a---temobamobazubixenok.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/dibadi.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/jakazusewolutubuziwekixo.pdfIn PDF document text
    • http://ossokahve.com/upload/file/72769411792.pdfIn PDF document text
    • http://szm.hu/userfiles/file/1306078441.pdfIn PDF document text
    • https://masihpt1.com/contents/files/jufiguko.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/xitikirazapeziwusabirulo.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14103541693.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/38734122559.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/posuxesudekaxivurupafafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rang+punjab+full+movie+onlinePDF 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_off0000d0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DC 10816 bytes
SHA-256: 1631d6a295c875c8e5d9e8a7ec3ee9aa0cdffd6defc2b11d023e0dccde88d131
font_01_sfnt_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 17588 bytes
SHA-256: be0341a92c9a70ecd51b70096fec5861963c742c5c0d96c676b0a4e8cdbcf56c
font_02_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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