Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c4b4361995c157…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 20:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 851289f1851f88c1e6cfdbd32639e965 SHA-1: 07ddb9e23797693da985130571d87b34fbf36a33 SHA-256: 89c4b4361995c157cec8ea0d9191ea60c706971ff996b15ce56e1f7d3f8017f5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, for being malicious and a phishing lure. The embedded JavaScript and numerous external URLs suggest an attempt to redirect the user to a credential harvesting site. The 'SE_MFA_LURE' heuristic specifically indicates the document is designed to trick users into providing sensitive authentication information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://queure.ru/uplcv?utm_term=install+fedora+on+chromebook PDF link annotation
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613467e49e460---mikomupesiletobomokawovi.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/juresume.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bixetarovunifa.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/vesefu.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/77482776810.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/33090088369.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/19730690344.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/vazen.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/jisuloto.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/6739518326.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/neponijukosifova.pdfIn PDF document text
    • https://tavio.ru/files/file/91487923529.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/nukegajis.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/292964972.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/65976350504.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/kirexik.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/8062375284.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/xawisoz.pdfIn PDF document text
    • https://geloracinta.com/contents/files/rekidumogobuzuvufel.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/dapinubowabafavafigenifi.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xuxavas.pdfIn PDF document text
    • http://3q1p.com/upload/file/2109090932222438763dp74zky0pt0.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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 17656 bytes
SHA-256: 30459a5a2de22dd3f61ad5f41cce0760b48a29082fe77c5e2c45a741aa538217
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 10832 bytes
SHA-256: d131caff5cfa0c9b5838dcfbc88eb4568d5ea17d457369dbcb74312902b7e419