Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d5d0287ca9a602…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 15:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64f7331fc1beb8fa51c322586edb554d SHA-1: 7e44cf8505af1dca60a351d10820febf662b6d6f SHA-256: 87d5d0287ca9a6021be2d8722260362455c3b07e29e957a0b4cea3e75578a874
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to potentially malicious content, with a high concentration of links on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=shortcut+maker+apk+frp+bypass
    • https://weilaimachinery.com/userfiles/files/86455366797.pdf
    • http://uco-kampen.com/media/files/44426907955.pdf
    • http://theofficeplus.com/userfiles/file/gamotokofadesatunoninafel.pdf
    • http://yacpa.org/yacpafiles/file/gamugawamiveji.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b6268139---pumuduboje.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a9e135299---nomirudorajoropa.pdf
    • https://tigapilar.com/upload/files/2384989662.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/tomipemuluvejemozomu.pdf
    • https://www.karelo.com/uploads/File/tupabiwixalazogakaxakor.pdf
    • http://www.gesas.it/media/mailinglist/file/76333134225.pdf
    • https://eniedu.com/data/file/20210910060620.pdf
    • https://palet-school.com/files/files/mikaxuxe.pdf
    • https://thefertilizergranulators.com/d/files/vevukemoziroruwanak.pdf
    • http://unite-chem.cn/upload/files/58344595370.pdf
    • http://msslink.ru/userfiles/files/62344906746.pdf
    • http://righetti-ticozzi.it/userfiles/files/sotiwuxobetineb.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/gobojemowomozo.pdf
    • https://siroyensao.com/upload/files/zazaxiwogeteleni.pdf
    • http://beauty214.com/uploads/files/202109110519036972.pdf
    • https://megacook.pt/site/upload/file/pufuzubamubovoli.pdf
    • http://cerrutistudio.eu/userfiles/files/tifopusuvonekasik.pdf
    • http://parikshitconstruction.com/uploads/tifapisawugimofodulisol.pdf
    • https://ezastupitelstvo.sk/editor_uploads/system/files/jikimadit.pdf
    • http://skia22.ru/pic/file/domonoxovezimedizaja.pdf
    • http://monterroso-construpuntos.com/campannas/file/21550498084.pdf
    • https://simbhaolipower.com/images/file/mitatibuseruziduna.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 16792 bytes
font_01_sfnt_off0000f27c.bin
53fadc6b9577751966eda29b5dccb3ea5e9c0fe17dbbb910b1b25fb55c200ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 18120 bytes
font_02_sfnt_off00012176.bin
6f4bdc3c99a05dc08b0f5559d980846647be737c754fc516bce7c51175c7a3ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 11024 bytes

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