Malicious PDF — malware analysis report

Static analysis result for SHA-256 2671b2cc32c95703…

MALICIOUS

PDF

82.6 KB Created: 2021-10-04 12:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b15d57ed16a966ceb82aedca9e992d7f SHA-1: 45cc274fc4ba226aa3c9bf0a1a4d922ab2dbede2 SHA-256: 2671b2cc32c957032c49775534e85e796207568467468a0e3c9f7f79ea1aafbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the sheer volume of suspicious links points to a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=bold+text+generator+copy+and+paste PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9056cf403---berazulafizomezusun.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/sosebibudasir.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_023646.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/gazerut.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2157525756.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/62926493318.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/zevozobikinujimuzuxes.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/3057757188.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/fakuzenodosotabupasopigel.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/xikopejefidemup.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210913083617.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/31743923288.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/jujakizesinoz.pdfIn PDF document text
    • http://www.siposferenc.hu/html/mojujesizipojigovipid.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20211002_204237.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/xunudatamidugoride.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/fefikofeta.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/gapumogivesimajilazosusi.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/68731842143.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/lasojirodilekedazivivet.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/mavikigewonewitesi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b85b6rj9e8qmibnddl32m1nse1/topimanifozizoxijodut.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/kikasuwononodegikoxarejak.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/fozijobeguduwadipezufi.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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 10864 bytes
SHA-256: f5fa31dad6513b261bf04588e02a296ce1c092e6eec88ac7c713b4d3c534260d
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 19644 bytes
SHA-256: a351c7fea5cf3c3be9d219d84c800a976c1fcb332ddad32474484938bf22feef
font_02_sfnt_off000124d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1