Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa5967768936bb0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 04:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f934a107151995c3de38dd82d2c01a2 SHA-1: 9394d957018336915bc6726573eca574b69ea76d SHA-256: baa5967768936bb0ace0acefe0b8f037a2bbf4a6970b68d5be1fc04dc805ae81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=always+on+display+app+android PDF link annotation
    • https://powermailer.in/userfiles/file/79927443502.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/mexogox.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kiwiv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86bf6f465---39503776616.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/pogolotelofazonig.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/fijerafulekatogumenupoki.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/ratunokoxozuraje.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/79447480639.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/bekugemebofoj.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/40luml1kejb8m54ho9e6mfja8d/66539762907.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/44973427531.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/95891338896.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/wabagegus.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/vefofevereguzilekerefomov.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/24805119584.pdfIn PDF document text
    • https://greenways.at/userfiles/file/78515942503.pdfIn PDF document text
    • http://prmakeup.com/Image/files/31152686905.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/41554500710.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/taladerezuboxixeradu.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/jutime.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/15636276332.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/repiragikaxisenumolij.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/tigalafabobexuxo.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/wubibisu.pdfIn PDF document text
    • 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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 10336 bytes
SHA-256: 7f8c62a5f28a4588b5052895a38b433172c7c9f41bffea3eda9783d8938f4ab9
font_01_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 17016 bytes
SHA-256: 55e1997ff5ae91e1c9201cfd3bdd9f531d308d315a9c5e9cde3594a6cdc54894

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