Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1858b963705a3f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 17:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56d4963e224fb19abb62c3758ba2b0a1 SHA-1: 55a02ec47fce943927905d614e96615ad7204a10 SHA-256: cc1858b963705a3f86f5985a764baeffec043d12fb99c807535366da94d55a6d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to external sites, with one heuristic identifying it as a link farm on disposable hosting. The PDF structure and embedded content suggest an attempt to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://af.ssla.ru/images/fornews/files/xadebujenivomorura.pdf In PDF document text
    • http://iktoktatas.hu/files/file/ralisidaguzagimugotevimek.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/39313609534.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/vatebadozomunerexe.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/dofed.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/namomafunatoniguwabavexir.pdfIn PDF document text
    • https://pixel.bg/img/file/mojorexobezadoremosimin.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/5903855677.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/28545548254.pdfIn PDF document text
    • https://led7.ru/file/89960617415.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/nopoletumafovominad.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/18391834538.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/demom.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bagobifivoraretaxupaz.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210922183759.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161463acbc73df---58342690619.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/45913541152.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/58281678267.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8iu3j7dh49h6rstn1417f8g805/93326537794.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/82492415706.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/25015250918.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109151353161506.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/fafaritapudexutevi.pdfIn PDF document text
    • http://parilka.by/var/upload/file/josakanogodaxonatudafaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=unleashing+the+ideavirus+pdfPDF 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_off0000af1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1B 15112 bytes
SHA-256: 8c3c7fac39c329ad62a05e4afea8beeed376a0ed77694412966d712c9e98bb31
font_01_sfnt_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6D 10832 bytes
SHA-256: e2f52b12a82a8d4b06185b58989290e710171ba9730786e271893f547fe5fb03