Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47bf15aa79ebed8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 09:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1190532c4563d675c852be2102a0ca0 SHA-1: 4ed592ac31e0ee3668288b641dc88d9203173e40 SHA-256: c47bf15aa79ebed8dbb4cf3913b083c717a3ab91aac59ccecc25bd83cddf1d6d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://medvor.ru/uplcv?utm_term=cast+for+chromecast+apk
    • https://gulf-rope.com/images/bulk_images/files/53004385388.pdf
    • http://sonarkella.com/userfiles/file/81881577330.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346f6cc1c96---lebim.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/memalawi.pdf
    • http://engroupe.ca/aym_image/files/kogizitewepagudufigiwej.pdf
    • http://humanitool.ru/userfiles/file/84137375651.pdf
    • http://tuvanluatdanang.com/upload/ck/files/regidubukutiji.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/visorofezefifiwarigazi.pdf
    • http://menifee.hanasushichoice.com/uploads/files/nolegoposixajomod.pdf
    • http://ecilingirler.com/resimler/files/34802447349.pdf
    • http://amunt.madteam.net/ckfinder/userfiles/files/tazuta.pdf
    • http://dichvuhieuchuan.com/upload/files/47803102358.pdf
    • http://honeystraw.com/uploadfiles/file/vuzapevuwupoxaguxi.pdf
    • https://equalland.com/uploads/File/zebowawobanifipupov.pdf
    • http://hani-bee.com/userfiles/files/fuzenobemereguxa.pdf
    • http://scales-center.com/shop/fck_file/file/pufasevudemo.pdf
    • http://abwingsjanaf.com/uploads/files/35564956997.pdf
    • https://niagarablock.com/application/webroot/userfiles/file/newupomovilulewasor.pdf
    • http://jucal.es/images/file/sasafovurelivezeravimuxeg.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/setimumewikonulo.pdf
    • http://www.yemany.com/yemfiles/files/sifivogapelufizuvoxipel.pdf
    • https://baoholaodong24.com/userfiles/file/lezunexuxesewenon.pdf
    • http://mobilni-kadernictvi.cz/files/file/3171732614.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_off0000dc2d.bin
0ff41d599b21c8d68cf2f76b571efd2a97f09b4c2bdea34d973f7dd55970b316		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 17712 bytes
font_01_sfnt_off00010a64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 16792 bytes
font_02_sfnt_off0001227b.bin
3aa63369e04c041b3a12fe4b1a4382e7a91dbc2a0dff21f74d6d06c87721f6a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 10624 bytes

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