Malicious PDF — malware analysis report

Static analysis result for SHA-256 223f5e304bfe4ef6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 16:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24a6fca2c5ad0627317c3ec7684ef8bc SHA-1: 8f48b576a3cab21402248a1835966ea2dc2b29ea SHA-256: 223f5e304bfe4ef6e3ee77e5539922c12cb3366390e1fa0f0fd61f21144b5ab1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple embedded URLs and heuristics indicate it functions as a link farm, likely designed to redirect users to malicious content. The presence of a 'download button' lure and callback phishing pretext further supports a malicious intent to trick users into downloading or interacting with harmful files. ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021911109142487.pdf In PDF document text
    • http://abovomedia.hu/_user/file/60976961180.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/63400206144.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/85660637676.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/96573115141.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/zaxogewizis.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/filutaw.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/murasupawatanikakopi.pdfIn PDF document text
    • https://tebra.si/userfiles/file/7973428055.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/54679598042.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210910110705.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/busitidog.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/kuxavodulolewive.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a9d3d154---52828251822.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/goxivizelujawox.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/31536114975.pdfIn PDF document text
    • http://rinsacars.com/files/others/nopeveviwilopume.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/27342061099.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/86357405982.pdfIn PDF document text
    • http://fitviewer.com/files/file/50928349059.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/1454472297.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911021617.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/xusepexunalosamudater.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/fiwarefepalizemapubiw.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3262497a4e781c58a06c6ec90a0ceece/29750823884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=airdroid+premium+for+pcPDF 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_off0000bb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB14 10284 bytes
SHA-256: 8e60abd3237e8c7a5324410bf1364d390d520bdcfb22a7983d00339a327cee33
font_01_sfnt_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 16456 bytes
SHA-256: 52b03a8abb032db7547d63a8f8dce05a1e34802612e70bf57a54c009dfee254e
font_02_sfnt_off0000fce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1