Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc6a3b7547ab866…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 22:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a100dbe6e3d20eeebdf2f8c35b611ab5 SHA-1: a46e70b2f5b45207afb98f7557cd44a463615639 SHA-256: 8fc6a3b7547ab8663ec2e16e3322192aa4167eabc2cd507e3fe7c43d7f039337
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=gif+apk+pro PDF link annotation
    • https://edusfera.pl/upload/file/pamojej.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/76835643120.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/sefopukaparuxozax.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/tabuloduwasaw.pdfIn PDF document text
    • https://esz.jp/img/editor/files/xudekuro.pdfIn PDF document text
    • https://isosklo.cz/uploads/pifugibonewejogi.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/4806570496.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210918032206.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/40844829802.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/22943374559.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zugalavarawixofovidemo.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/xefidexumikitideg.pdfIn PDF document text
    • https://durimawar.com/contents/files/3249693835.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aaea349da---xoxutigilalogazedaxejef.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/43589113674.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/wefekukaluv.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/17028580688.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/kixuxegidibowinewafafiven.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/91139252052.pdfIn PDF document text
    • http://newo.ru/files/files/9340578718.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/2464192535.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/6719524494.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/tebifokaniramipevakos.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/41055888441.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_off0000af10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF10 16888 bytes
SHA-256: 1b4958948597d0401d189a4d0e07ce03d0cf2eb5661479f7be3f2f5148df4fe4
font_01_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 9936 bytes
SHA-256: 63d5fa599f40caf24aeac717e0dc147feece0bda4254ba8a4fa64c2e2c82af87
font_02_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1