Malicious PDF — malware analysis report

Static analysis result for SHA-256 9029c1d792460cff…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 00:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3a8e3826cb900213040d60c0f887f90 SHA-1: c78ef53d075d5f835e62b77a23e2d29f9cc05519 SHA-256: 9029c1d792460cff34e202430544596825b842b20c07586d4e2bdd92943dcfdc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://vijyaiprismcrm.com/userfiles/files/gumenagituzavobufivezimak.pdf In PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/45816930610.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/2775623667.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/zinawuzubi.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/14024939970.pdfIn PDF document text
    • http://hingliltd.com/userfiles/38102286140.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/mozonuwuluvedirojomabano.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/juragaferuvuwakusokafetab.pdfIn PDF document text
    • https://salonrewards.ca/images/file/38252409373.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/85062252489.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a8ie1f3neb23r4fum5mol6nfs0/55041175395.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/11390837268.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0d6825000f0c44c4de2155c1a4c3f731/mivepawivomutozu.pdfIn PDF document text
    • http://e-sportis.com/images/upload/68974605978.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-9/20210909033650155297.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/36396610283.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/xuzubilo.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/rizujabakag.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/ginukakowova.pdfIn PDF document text
    • http://modern-pro.ru/files/file/xifixa.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/lanemazesimuvovovekegudux.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/43967954365.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/59526036420.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/50445005468.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/danugiguruminanodazim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=add+ons+for+chrome+androidPDF 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_off0000b083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB083 17756 bytes
SHA-256: 9b6c86bfda745ea23d5994cbdf5f93ba674ed3a6ae7ad05d1cd7c323a55ef463
font_01_sfnt_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 10576 bytes
SHA-256: b466b257c57fb5160af48dfd3b402a996c91fe28efbc818b8b2064cbe98180e0