Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fb23807f2e51b8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 06:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 739a81d391c232bce6cecea311c2c1cb SHA-1: f4f5280009aad60f3be9801b8f9e2db302155b49 SHA-256: e1fb23807f2e51b841ac6be22a5782f3cceaadf79cbfbad03eab6788cd4c3114
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the link farm and the ML detection strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=importar+vcf+a+android PDF link annotation
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/072d2e237315bdaddbb4842615bad828/zutofakarimejakitiw.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/badugupijafijulojefu.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/85926615803.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/57962617500.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/94458666003.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/kidisav.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/xotusakezixizafufokegipe.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/56103665786.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/9821268372.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/14117573940.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/99918929290.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/26187674584.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/55548494920.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/67525398777.pdfIn PDF document text
    • https://network-italia.com/file/35403412122.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/woxesaveniroxapajeza.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/15654427302.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/vuvufiruja.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/dativobezanotekidedelix.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/jirapupegudeliv.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/ledizedo.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/nunigiwibutetexut.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161318742e46f7---muluvuvadojifezujupafi.pdfIn PDF document text
    • http://indexone.ru/upload/file/remararezojiwesununupov.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/71825141935.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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 10452 bytes
SHA-256: f3a08b32e0110bff029950feb7be60d788cba641077173698047de4940296124
font_02_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 18600 bytes
SHA-256: 09446d3a7e9a72972399a7c0820e915fc6b1367328aaecaf689b1e34a690e43c