Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa802ff62d7227c…

MALICIOUS

PDF

74.0 KB Created: 2021-10-06 16:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c6ea56837dcb0cde0293e556da46c70 SHA-1: f008e2365e5f7650b6d90b9111447d3c71b2cac5 SHA-256: 1fa802ff62d7227cef8a9528922d235dcaba281647362c1d91f88d55f6956e6b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to numerous domains, including suspicious ones like nomylo.ru, which likely serves as a lure or distribution point. The presence of JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://nomylo.ru/uplcv?utm_term=pros+and+cons+of+small+scale+farming PDF link annotation
    • http://hig-hegmann.de/userfiles/file/18855380012.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/lezibisobor.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/50117424001.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/mefoxoligitoravewakimum.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/namapikufoxavub.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/85339267228.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/lijodub.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/48313236354.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400dc3c4db3---63407029738.pdfIn PDF document text
    • https://pixel.bg/img/file/genozumosapolenupepagag.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/55631177196.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/ruzepuxidukobo.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/62884369008.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/votewulafanotibigiduvo.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/87928083892.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/60925717573.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/20491009122.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/zukibafanumadijaj.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/xeridigedizevekomaru.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/tinasemevituribupezesig.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615728dd57ffc---rosomis.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/88899859170.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/11913360684.pdfIn PDF document text
    • 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_off0000c0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DA 10724 bytes
SHA-256: df108614974fc587ecc0d8381db3eabb8cb5bed4237c996343e8be3b9ad5cd18
font_01_sfnt_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 15968 bytes
SHA-256: f35754df40a94def33f552d696e864ded36850859e5df92266d1b22bbcaeed34
font_02_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1