Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc8d902a3509ffb…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 05:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb0ba4e3bb14b416dcc5302a5daad681 SHA-1: 920bdae5888f40b736508117e451d7fbaefec56c SHA-256: bbc8d902a3509ffbced88891a94060c6969cd17ddfa0577686997fcb390486f2
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on disposable domains, combined with a heuristic for a 'download button' lure, suggests this document is designed to trick users into downloading further malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://avanti.pl/userfiles/file/88615493268.pdf In PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/dejabizejinukubabaxisom.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/dijofuwonojawunagogevufon.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/47101005102.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/tulanuwelubazovave.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/19528873159.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f003024ace---80747408719.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/70571902635.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/nawevesivinosid.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210907095651.pdfIn PDF document text
    • http://geasit.it/userfiles/files/jewirududoduvomewapelavi.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210902_075330.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/96576076632.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/11749186422.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/89490683128.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/gavejugamiwekej.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/fudevopusugaxe.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/58201435696.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/70273261243.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/97899462195.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/27862668856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+fire+free+skin+apkPDF 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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 10156 bytes
SHA-256: ffb639981b3d63586c905a403b013d35554df7933d7bc2c269bbc69193451850
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 17852 bytes
SHA-256: 94ff30bf58c0cadd0957bed3ea32e34164930ddfc95e4afa67c3ecd0ea273e63

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