Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94de65ed040e12d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 12:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71174624ba95576419d5ac7ab82bdb37 SHA-1: 33e2e824ae022a761e7c2be4892389a848f3314f SHA-256: e94de65ed040e12d733db48fb5d70c2447f0d3ca0c587162c9ced0455bfac13a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://smidgel.ru/uplcv?utm_term=install+previous+version+of+app+android PDF link annotation
    • https://lufty.cz/UserFiles/files/21194564494.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/75317582157.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/dutidizafujudekurotobuz.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/89931112279.pdfIn PDF document text
    • https://greenways.at/userfiles/file/malutaxafu.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/81064967228.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/6370579902.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/nolivumide.pdfIn PDF document text
    • http://co-mit.com/uploads/files/tititoxa.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/83630884686.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/68071063313.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/mazuninulidifu.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/37925875746.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/57757459935.pdfIn PDF document text
    • http://synowka.pl/galeria/file/dasijosalunevilorinu.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/19935eb9fab101f29571a9ec1abbbc57/wajedage.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/79478760430.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/14480456575.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/jozamifufawaj.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/fevanorirobigebojinezuse.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/57526710882.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091222161470554.pdfIn PDF document text
    • http://freeorden.com/media/file/32751868588.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 10608 bytes
SHA-256: e70255893b6447c259f1f92903763bb598e4fc16a7371af94bf64888faa7fcd4
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 17368 bytes
SHA-256: 9ff57d00850fefd23ab70150dfef85427bc9441d46e54626e1f0053bb62cfdde
font_02_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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