Malicious PDF — malware analysis report

Static analysis result for SHA-256 75984bdf3db8d632…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 20:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa6c4c7861dd6e1a0131148d13b52735 SHA-1: 508afd5da1443bfd2d287233af024121de9e4f77 SHA-256: 75984bdf3db8d63264141e977e174a12e1480c9c6c771f3a90157c3662917d16
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous links to other PDF files, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were directly extracted, the structure and numerous external links point towards a malicious workflow, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sichera.eu/userfiles/files/fopolowovi.pdf In PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32650132250.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/52784019423.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af8d3ccbe---xifujirumeg.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/pupozixid.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/72491906012.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/gijaniwinuxid.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/kizinemejorole.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/47546556785.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/titevofapejikokodivop.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/39423087333.pdfIn PDF document text
    • http://arsvet.ru/img/upload/99268698767.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/77048032630.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/52444031432.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/woneleveluketuguvebopepis.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/58307850379.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/88389325715.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8001e41b360473ca7c7ce5f7df5bb777/didutupifirizifitog.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/putevabelixesiluj.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/92082268448.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/69506121323.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/26008405433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=conjuring+1+telugu+dubbed+movie+downloadPDF 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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 11028 bytes
SHA-256: f95761568a4f7a539a055b775303bb19beb3ab11c1fd41fd4d0a4b62ac73b37a
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 17692 bytes
SHA-256: bfc49b0d38fc512b7f767d1caabf7512d732aec904157870ab7bcd89f6ca60e2

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