Malicious PDF — malware analysis report

Static analysis result for SHA-256 406df658faf7f642…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 07:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b90b8e03cc357cdfd5b4112bcdd19dd2 SHA-1: 0f6dd082c0ba3e0693fad7893f4d80207e419010 SHA-256: 406df658faf7f6429c78207eb2435d5dce5e8c92b64782f51180065a50b55008
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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://drafthe.ru/uplcv?utm_term=how+to+get+free+robux+without+verifying PDF link annotation
    • http://universalthailand.com/images/uploads/ckfinder/files/37336706445.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/3880244224.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/9498649014.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/3993120289.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/95947149027.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/rabakigazowikojirizo.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/84472455167.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/boxifasukebuwasupugadobi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/99637081702.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/24568604850.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/58056498517.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/64863519477.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/73050522186.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/95417250536.pdfIn PDF document text
    • https://o-dance.com/upload/files/5167390460.pdfIn PDF document text
    • https://oasis-travel.ro/files/depidudoxodurawopopum.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/6719524494.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/najewenago.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/bipufonivefabijoruki.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/derolowenewegagururuf.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jedobovenukota.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb4aa8ca8---natuwakolo.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/59313574963.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111b440607---16079957842.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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 18544 bytes
SHA-256: ab394af4c9c4240980927e30853ffcb76602c781b71e7a5350cd5e1cdfcf1017
font_01_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 10716 bytes
SHA-256: 812e9beb7291fed0a1ddc049a2717505e4a64c2dd76baacb6f33e351ef1c74a0