Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f471bc0b00a974…

MALICIOUS

PDF

67.6 KB Created: 2021-09-10 02:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddba501e7cf75ceb2555ef0b7a655d3c SHA-1: faddb502eba9b202a56ecb6deffa4d60b7fbfe66 SHA-256: 44f471bc0b00a974d22b71be876dcafbb70c7090beec2954b2111bf80db31902
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide malicious links. Multiple external URIs were extracted, suggesting the document's primary purpose is to redirect users to potentially malicious websites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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=now+tv+firestick+apk PDF link annotation
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/23186186295.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/10866526869.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutipenutek.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/fowidavijeropixenojepivok.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/55316014516.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/42199552140.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210905172944079.pdfIn PDF document text
    • http://arsvet.ru/img/upload/dixozepalajo.pdfIn PDF document text
    • https://cooperspick.com/files/99676256460.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/84993435613.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/notiwapebuvoxo.pdfIn PDF document text
    • http://355353.ru/userfiles/file/69196516839.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/47425942648.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/nawumonuwisozudajagegoju.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/vegatedabijiwisesijufosob.pdfIn PDF document text
    • http://pinxedien.net/upload/files/sosidarumesidazizebiwanos.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/lijogul.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/73590894127.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/76347126812.pdfPDF link annotation
    • http://cancunday.com/travela/img/files/10955470401.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/57528317212.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_off0000ae90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 10544 bytes
SHA-256: 4ac47976a47bc7e585ac656e9dbdd23100b7dfacaf435e5bd8bbfdd6edefb3d5
font_02_sfnt_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 13800 bytes
SHA-256: b6d22d2d8e68f433850c218b3fe820e7f0601fc017289939cd65aec2095fb79a