Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a2b5e26d17ae98…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 05:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9b90fa06b97ed1877b2e131073b0e3b2 SHA-1: f40e35fc66d1c237ee483fe21f9a5ac2af90dcf8 SHA-256: f6a2b5e26d17ae98ad9d9402cbf350b06104b7deb1ae84eb17343476f61c3038
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The heuristics identified it as a link farm with numerous external URIs pointing to disposable hosting, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links strongly indicates a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=wallpaper+android+tv PDF link annotation
    • http://klemanpince.hu/files/file/fikerexaxa.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/lotosijepoteta.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/bevavoxigaki.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/logadiduno.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/xofefiwubikazaxopajugabi.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pebejalo.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109092348245738.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091002171589.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/62883240776.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/mutowusakuzifipefes.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/garowilux.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/10562729427.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/17832244075.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/gifakopepener.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/201b61a7ac17a2c1514d930de789a5e5/71407137961.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/loworakofupazekuzotape.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/vesidinotet.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/70342118272.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/58911913891.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/dre6kvc1jt7gvvucukg8l08l15/71799473772.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_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 18232 bytes
SHA-256: d30c9129ef7bb486c7bfb6cd9767b0e1d4ba49e7dd079fbf4cf417c56740162b
font_01_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 10276 bytes
SHA-256: d19f6f1d2e8da3291b00a78c2cb0b28113180402575d719367b98a1f3c470a50

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