Malicious PDF — malware analysis report

Static analysis result for SHA-256 9790a0562ef82794…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 13:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 248d10287ddfb5a9132454733245daec SHA-1: 2a994dfdd65ef2b8a26be5cc22f34c220c12bcc9 SHA-256: 9790a0562ef82794b0d53a4fc8431fc86ff1a7edf5ab253b241928a1e4bf2029
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous embedded URLs, some of which are hosted on disposable domains. The document body, though heavily obfuscated, contains elements suggesting urgency and a call-to-action, consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nikolalepojevic5.com/multimedia/file/53876958480.pdf In PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc98b505d---95611846262.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/nikugaruzivaletobo.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/81537982362.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zofinasuvegikagalut.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/94004980383.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/vepawutajekarazafed.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/12285167579.pdfIn PDF document text
    • http://come2menorca.com/images/file/joloropuwamisogaxuli.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/70297053467.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210916042236.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/gurujukapub.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jarusoxuwenuvodadere.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/96193518967.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/30919546256.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b4901232d7caad5beb5103b86261c306/9888824203.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/nowumekagajenibaro.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109061007512589.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gurafosav.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/34678283291.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/pekazoluvimal.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090522314824.pdfIn PDF document text
    • http://pasaru.com/upload/files/vopogezowulogaj.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/97316792114.pdfIn PDF document text
    • https://theipbuzz.com/images/file/93063515321.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/dolipirokulemijirukax.pdfIn PDF document text
    • https://clickbox.ro/images/file/bozujenedexut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bhaag+milkha+bhaag+online+streamPDF 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_off0000c963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 10840 bytes
SHA-256: cb0d67ba3b10fb66cee6b41eb367eceaab5dff32f57cda05d2d4ef78e52a113a
font_02_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 17256 bytes
SHA-256: 8e34150c14dbc2625d7f95acb31849509d083bf5710c193fe52e7e620795125e

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