Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f813a6f21f837c4…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 13:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1833eed0bf2dbf81f69ada97958bf0db SHA-1: c18c5086674cc74e9f7c5428e0d296ac243999c7 SHA-256: 4f813a6f21f837c4b15b80e2ef272d716148a969bc9a46ee7978e9bcd4bbed23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=pubg+mobile+lite+vpn+mod+apk PDF link annotation
    • https://suativisamsungtaihanoi.net/upload/files/49623328216.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210901_BB9CF071ECFFC2B3.pdfIn PDF document text
    • https://cargobull.cz/res/file/wiluf.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/04/39468358317.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/sokuwisozajajaduwodira.pdfIn PDF document text
    • http://soupworld.de/upload/file/59451146787.pdfIn PDF document text
    • http://consade.com/userfiles/file/29622913668.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/31655041390.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210913_062755.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161360630bf048---jirade.pdfIn PDF document text
    • http://telecycling.info/files/file/33846259857.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/72985743052.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/sedava.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/12597075841.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/30176308925.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/wugenidar.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/931f043ec2ee62e77a25309a562023f9/fugajakobelazubami.pdfIn PDF document text
    • http://superazs.ru/images/news/file/4363507258.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210907_F9688317D180DEFB.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fubezidutopar.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/wubegog.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/jilunurufabeludulola.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/rimix.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/kopomo.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_off0000b76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76F 10868 bytes
SHA-256: 27bf53867123c8289819059016e27701084d2f1d4fe4302c47333cc4d13b090e
font_01_sfnt_off0000d00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 16816 bytes
SHA-256: 06932af23b64d5ec53b839cd15edebd31a2f1a4fc7012ed1288f68d9aaa44d92
font_02_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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