Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e052d12324c9a6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 18:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec040e167cc74b49601ef2cf7f406f23 SHA-1: b58fae5a1e369e41dbe0a71521824b7950621837 SHA-256: 68e052d12324c9a6d79cb1411971fd382eafcce132f4297be202a94e6fdcf4f6
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic identified the document as a link farm on disposable hosting. The embedded URLs point to numerous distinct domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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://riskhedgetech.com/uploaded/file/9950926133ba12dfef2.pdf In PDF document text
    • http://residencecarlofelice.com/userfiles/files/goxeluvef.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614548c750973---52517464904.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/megepimopenedemowod.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jamikun.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/radawanapavevawogijis.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/fabifav.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/kakisusumedifodegikedowa.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/tigarijorederujiv.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/90373985493.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210904142047.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/17267589835.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/mukapokalowuruf.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/kugijasuvutovizun.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/be170422a3df70f505d9860904889acf.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/tuxebadedizemuzigin.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/56439458471.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109190517135096.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/vubuvixudoziv.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fef26a2d9---kafoz.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/70313602743.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/60566854122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hide+apps+in+androidPDF 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 10232 bytes
SHA-256: 03a1db0e62b9b7cc1d780b7731bf61c4ebd4cd12f10d47f6594d1d0beb48b185
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAE 17348 bytes
SHA-256: 8ff24661cfdc102d6e2b246e4a67a0e5da3e4be1ad56f5807367b9611cccac63

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