Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c64fb0fe9d1087a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-23 07:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 9ea57b0ed926b03acc72f32b39432a4b SHA-1: dd71974c64ef83457439cf55f6f341e9d4fc4238 SHA-256: 8c64fb0fe9d1087ae00cc40ee6325929177239e1b785a32dd7f515ba369f7abe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to disguise malicious links. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=ap+biology+textbook+pdf+10th+edition PDF link annotation
    • http://top1np.com/ckfinder/userfiles/files/mikagetusili.pdfIn PDF document text
    • http://teifsepahan.com/files/file/bivejadoriwenemowuj.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/3963605430.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/36984909281.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/89641097447.pdfIn PDF document text
    • http://chapelguild.com/images/usr/12008378242.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/22992462573.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/058249bec87b1a2152937abca1f2639e/83902235523.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210901083824436809n7ri4g.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/fudekuxifaxowazegu.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/42511796101.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/xumegevutuxovenokigajogo.pdfIn PDF document text
    • http://capri.lt/userfiles/files/ponavexoruriwutafavugom.pdfIn PDF document text
    • https://bselink.com/userfiles/file/nupatesupupif.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/patogunisanugutita.pdfIn PDF document text
    • http://glttek.com/userfiles/file/ruruwiwizugadigipuzumobus.pdfIn PDF document text
    • https://webhosting4.net/media/file/pakalawikakoxugatusekub.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a42bb5b4d9---82148521243.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/65524701629.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/libov.pdfIn PDF document text
    • http://rld-carbon.ru/file/vuvegofojalurekepumefom.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/kadedugodokixuvetuke.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xifafazebetogo.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/losefoza.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_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 10952 bytes
SHA-256: 0aa43dd048c15f5ed3ae09903d2b79169500a450e1c48104e55a8e0392affee0
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 18836 bytes
SHA-256: 9bce1c9c062f3ccba57117234dac061e4761cf5ab440fd2f58c92d5ec4e7133f

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