Malicious PDF — malware analysis report

Static analysis result for SHA-256 af91548196349370…

MALICIOUS

PDF

68.8 KB Created: 2021-10-14 04:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1f78f7c7da485b2e2201088633331b72 SHA-1: 09f0687685cab1ab51d2c04e16878b3822c8789e SHA-256: af915481963493708295eb8163259f38820260222448f41a2decc2583a79fdcd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a single image designed to look like a document, with a hidden clickable link to an algorithmically generated URL. This is a common phishing lure, often used to redirect users to malicious sites or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161675882e6110---42885595112.pdf In PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/zitom.pdfIn PDF document text
    • https://www.poole.ed.jp/system/ckfinder/userfiles/files/kejokowubexodas.pdfIn PDF document text
    • https://mklaassen.nl/images/file/78967961035.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/35750036374.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/godebedamodemejibuxiwan.pdfIn PDF document text
    • http://taxfreepoint.com/file/kivozunamugobixofitikafor.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/98655928183.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/belevafijugewilun.pdfIn PDF document text
    • https://mattress-leader.com/media/lowepozazulepagegikonozol.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/nidowowifazinumofesexifa.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/mazovetonodawijug.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/tuluzofetafu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1632204606.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/zuvalema.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/ridisaderilok.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210927012207121877on3d975xfe0n.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202110032229322413.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/ruwitibimafuxividixaju.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/j4udgulns1pecdh5kjuoc4e0aa/53198820902.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/suwab.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/xojumup.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/85183483055.pdfIn PDF document text
    • http://becucci.it/userfiles/files/merowenujudonazi.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/7578494881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=dichotomous+key+for+leaves+answer+keyPDF 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_off0000b14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14E 11060 bytes
SHA-256: cfe860f131f76841428d31e1cf25a626f6a8a5e4717838c8f386ebc3597d46eb
font_01_sfnt_off0000cb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 13936 bytes
SHA-256: 96896444730df31ab8bd53b40dbd2d96a3b95c9c19d5ca49ebe6199f6b6587e8

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