Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6590f65a850a9f3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 23:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37339ce8eb9dc9d1ea6227c960bd80d7 SHA-1: a832326d27f8c32a63933149bd18156fad2b32d2 SHA-256: c6590f65a850a9f392a34ce7093825586dedc371d5071e560b367043e94e0872
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://evo-models.com/uploads/userfiles/files/93028371271.pdf In PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/vebumama.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/74940980355.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/92571598485.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/digekevitobivipu.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/57868253594.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/80386470052.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/48181456481.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/89523800699.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/xojimeno.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/wipigibibowelemiwabo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/63139415681.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/patexewuvu.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/vifubiwivisiwamu.pdfIn PDF document text
    • http://clerus.hu/files/file/35112972763.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p75t0mjl5n87s7uddtvi25irv3/luveruzekiwogesemexekezij.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/53318773141.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/kugevojodajomebidume.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/balika.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/gaweteralufobidasugexer.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/nunatu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/xutivekidatapuzovogelo.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/5039011532.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-10-14-14-55-79.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=auto+clicker+apk+download+for+pcPDF 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_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 17712 bytes
SHA-256: 7d5f6d16f678cda40b1494cd738fa8e9cd45f5431627d6e689ae201fd0e2aeb9
font_01_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12004 10704 bytes
SHA-256: c93f705c5f641e1ccab6599e088e110a74379f5a3f8bf8f38de14a11d16410f0