Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4de73434ed0b07…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 03:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 395633028b47a61938d4772e3770b203 SHA-1: 2e6593ba20c0c78e6a9e183eea7797ded6a9ecd5 SHA-256: 2f4de73434ed0b075b31c941ee80aa9316a573ff2a7b2b70a96b734c4c98014e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=tango+apk+mod+download PDF link annotation
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143903410bc1---xegudalakamozotulo.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/xojonopenejutizixivosepaj.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/gewobiwuninajosokorelut.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/18339686448.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/mudaxowoxiwuw.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/46183671538.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/71113657879.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/58824799095.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/31894402044.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/79269644049.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/pozezekoseloruwedowobar.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/rofesasunutomanutaripep.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210916131301.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/4333865655.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/wutonetixidebuxeri.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/88691239270.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/52625b4884c6eb51e746cd95da4f9abf/2750216843.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/58283335892.pdfIn PDF document text
    • https://telorgabus.com/contents/files/19681792665.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/sodegoluvemukol.pdfIn PDF document text
    • http://suurelepa.ee/data/file/55737176226.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/40814121989.pdfIn PDF document text
    • https://totounited.com/contents/files/kojadufapagilasumax.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/27348859607.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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 10284 bytes
SHA-256: 48ca3594e315591cb4f4c18227465f4a4fd6e929b86ef18a4cffddfc7acc6df3
font_02_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 20064 bytes
SHA-256: 0c29dc1c6fa477aa79b19aff6f53217a5af3e67987e7d8b9626fcdb08aec5074

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