Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ec7bf6fc5511a1…

MALICIOUS

PDF

86.8 KB Created: 2021-09-15 13:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07349c4c58a54b6d226e284e934400bc SHA-1: 5bd81181d30c0a052d9a8e1867609dfda12e9d63 SHA-256: 54ec7bf6fc5511a1e851b7bc3429eb30113d08305841df9ab671f22f2260f56b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=game+cracked+android PDF link annotation
    • http://galluccifaibano.it/userfiles/file/komanisixefuzoragoxu.pdfIn PDF document text
    • https://network-italia.com/file/91196179137.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681c7e46aa---51194038694.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/30624934299.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/19934193467.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/31023626090.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jisosotufiwikuvafavebivox.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-8/20210908181948739464.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/3625679701.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/28039608201.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/70359226699.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133989f891f1---fuvujizetasuki.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/dijifopapeme.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/41093802519.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/28181069236.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/potisozusonesepepigafopa.pdfIn PDF document text
    • http://innotack.com/userfiles/files/konipagomup.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/lakomuwisapigax.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/zeruniwidaxote.pdfIn PDF document text
    • http://risme.vn/files/36153995036.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/68196560753.pdfIn PDF document text
    • http://delve-cr.com/uploads/70553021864.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/babarakanesaw.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labobi.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/robododusugubet.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/5571933031.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_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10348 bytes
SHA-256: 0b06a04385554cb7c6ef9a50b119d0f4ef78aabd5e49cb7ef7f07f07093ce8b0
font_02_sfnt_off000121b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 17024 bytes
SHA-256: d2e54a3b78aa2e4e30cc5b6e0d77049c529eff7963aa067620a98d3a3705415d