Malicious PDF — malware analysis report

Static analysis result for SHA-256 be72fd407162c5f7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 23:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6ce10ee7c05c2132901d62451a65bb3 SHA-1: d6aea7994859d6b43968252c1760851e08cdf998 SHA-256: be72fd407162c5f7d104df4ef738363162eb6079136e11d3840968e8fe70d5be
126 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to disposable domains, a common tactic for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://novafish.it/userfiles/files/41864429290.pdf In PDF document text
    • https://komunalno.vrgorac.hr/files/woribupanavewopinasuse.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/jewevum.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/domagijaxarisunebijugebex.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/vixinatugiwozajovuzula.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/8604567598.pdfIn PDF document text
    • http://temple.mo/userfiles/file/46148705435.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/nogolibija.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/78487176653.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/bexusafevamazezes.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/61456274106.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/sutifiworogorijoruluto.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/muxiwurerefawevaroke.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/47002654343.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/pinovil.pdfIn PDF document text
    • http://sergeybazarov.ru/file/luxenodapisomusodofevus.pdfIn PDF document text
    • https://signika.pl/Upload/file/votig.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/45779676816.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/sisul.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/be170422a3df70f505d9860904889acf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sholay+full+movie+hd+1080p+download+filmywapPDF link annotation
    • 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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 17156 bytes
SHA-256: e039d14917bdd4550b976492022c4aa542574471737d526e945260ee981872dc
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 11220 bytes
SHA-256: fb7d31379eee24e430ea41a0cf1a52c107d283862f91263fcd3b8993f47046e4

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