Malicious PDF — malware analysis report

Static analysis result for SHA-256 b135f3358d876d33…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 10:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ee176ada113f1beb7eb43477ad15fd2 SHA-1: 1e6032c5500fc45dde48bd4ff3d68945782558ef SHA-256: b135f3358d876d33996ed93e91c811c25d936837bd2ea0769f5bc0542e35c2bf
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 as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with one identified as disposable hosting. Although no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://dominoliberec.eu/images/file/files/91944920216.pdf In PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/14730029627.pdfIn PDF document text
    • https://retta-bg.com/userfiles/xasabixibosedo.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/40936940866.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/sozasosipulizobazoge.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/28888408904.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/nelederesuvo.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/piritawigodulamowujukom.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/21333951628.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/rinuzupopoxinok.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/53742583629.pdfIn PDF document text
    • http://hflchw.com/upload/file/lovobe.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/71008650987.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rruffahscru03ptob6kdfubn4v/miremeg.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/sexokusijela.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/7602240072.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/mafunomagogujerawirukilev.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/5127830252.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zuzanibijupamixoge.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/14638592759.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/53538942778.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5a91386ff4e463c6a70051cc2d6305e6/toparapofabanunizinuni.pdfIn PDF document text
    • https://tele-video.ru/upload/files/votegulisafaba.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/soliv.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/20102303478.pdfIn PDF document text
    • https://blugarden.eu/file/30383283594.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/jesotitafesojexamutimidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=car+x+drifting+gamePDF link annotation
    • 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_off0000bfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 10496 bytes
SHA-256: 64d0e95e55ad148afe0a9ec361997578ba30c5957b5d4f522604aff2187760cc
font_02_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 16392 bytes
SHA-256: 977cbbc13f7de42a4463ff2facb71b26c595a351e11b9fd0ecb75fcc44fe58ad