Malicious PDF — malware analysis report

Static analysis result for SHA-256 097e54a41fccc885…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 18:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ff0484bf95cc180510905c75a8ab299 SHA-1: 4e34c0ee7fa017723e85b14046ec0a3c89248347 SHA-256: 097e54a41fccc885071a72a7cd24a6535f84294bb3098996a018f9e69a6eed8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are obfuscated or lead to disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many distinct hosts with few links per host, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=download+mame+emulator+for+pc PDF link annotation
    • https://makojudo.pl/zdjecia/fck/file/40270469846.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/depopufimibufotim.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/75488588090.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/41812913642.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/rureretutuwixotuxoweli.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fiposareleledunugob.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/23589606713.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/ketudajifawugowisox.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137352079a0d---vekemubizesovenemikuvola.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/76168389970.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/55133352471.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/winefizamatudi.pdfIn PDF document text
    • https://produse-zilan.ro/files/walukozafuxug.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/19602664052.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/83541992031.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/68051735484.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/gawajedavuwovekej.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/94317492887.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/soxiwopovetovuxababulu.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/83700567006.pdfIn PDF document text
    • https://birudongker.com/contents/files/54278755529.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_off0000c4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EE 17184 bytes
SHA-256: c59ea18aabb1bc3b370eaf424817edcbad9436feb0a4ee17226ec085f3e6f149
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 10708 bytes
SHA-256: 27376c1ad608cdfd36f28a8d2a449a04a0b76f0a6a08f6512b04b85776211a1e
font_02_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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