Malicious PDF — malware analysis report

Static analysis result for SHA-256 17605aa0e6787699…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 07:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57d7e225cbbe8fdbf4b25cb6b7d302bd SHA-1: 177b6ca6783461fd91ef79b9a5c82739e4913b7c SHA-256: 17605aa0e67876995ef9bf3337c02765f26965c4ef55be6baf4c90d080230fdc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the purpose is to host a large number of links on disposable domains. The ML classifier and ClamAV detection confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://ikitellirezistans.com/upload/files/xubifupanakedale.pdf In PDF document text
    • http://juentai.com/userfiles/files/jejojoxigopukavabizax.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/jamaguzisigaso.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/riradebomol.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/14573426355.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jusek.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/letafupuwiluroz.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/171801283.pdfIn PDF document text
    • https://cooperspick.com/files/28841191848.pdfIn PDF document text
    • http://lg-palette.com/upload/files/6018391806.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/dudonuk.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/wexidekezed.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/xuzuro.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/togitisolo.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/92768869760.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/julali.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161128444c8092---lewametivadegawix.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/zeporazobobomizudivirid.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///fekamuramu.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/98306780173.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7b7bed3adbd6bce6e812b53df93e267d/90434444803.pdfIn PDF document text
    • https://alohasafaris.com/files/tusobin.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/remivuwek.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/gopevijigutowobogeraf.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/rebabamavumeka.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/musiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=this+is+the+end+free+live+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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 10528 bytes
SHA-256: c801acb978139ce0751acc3d677919ee3c156b0a87d2a1696b6af04528c50de0
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 17476 bytes
SHA-256: 596719cea92dd7e5119f58a5dc0bd56d1d62ac1bec23db971833a6808c5e76f3
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1