Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cb7144deba302e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 07:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f33b0b8d4418ef427ea45891bf6bc8a9 SHA-1: a680a056828df74a1045b42e23b32eb45acef98f SHA-256: e4cb7144deba302e7615b2a34cb13468ebc048f1a89601e8567a2cdf85ad1d2a
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=the+burning+bridge+pdf+free+download PDF link annotation
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/46922806232.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/vatakesegolikup.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/sumasovajowavexafunep.pdfIn PDF document text
    • http://toonesk.com/upload/66132250330.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/toximafaxakutafakuxabob.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jegatejutojefedikobavi.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/webukix.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/37163341245.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/47241654276.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/44788686115.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/guvevimetofajikagow.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/kibowilopagikulida.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/risizekonid.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/jaridedov.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/idigs24622bj4cu7ascb8t1iaq/povejewori.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/mujeleduralejepidaxugip.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/mazodukakegezu.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/didazu.pdfIn PDF document text
    • http://hkacca.com/userfiles/fuwutejojosakasumas.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/12309995665.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/87147818713.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-05-19-13-46-djIWlAme.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/43592431704.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_off0000ae38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE38 16400 bytes
SHA-256: 54710aa6dd09893cc7edf26541dddd9efed97a83a49f988e77896311a25d069a
font_01_sfnt_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 10800 bytes
SHA-256: e7bd4bb87ab605c8f21f54687b5ad28b5e01a1c8dc2a371a68bae619d86c0a36

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