Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac28d4740dd4df3…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 12:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84758f6d31816d8ead6bcd5676ae6a5a SHA-1: de42f559215140ba8d8fe8895de562757991ca68 SHA-256: 8ac28d4740dd4df34e3fce8131d399f19cf40493141af4366c090d0ef85327fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=exclusive+android+apps PDF link annotation
    • http://royalleasingny.com/admin/images/file/sukidumesesofejafadaxokak.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161426a4386bf1---29875704176.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/80322541980.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/pifapupivuralevomorezebi.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210901161104.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/96995338904.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/xozidegogujunuda.pdfIn PDF document text
    • http://e-menu.hu/editor_up/xedimipifi.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/74117889777.pdfIn PDF document text
    • http://ipublicity.cz/data/file/lanixewu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/adb38ccfea07e9b17ab61715785b5909/madubu.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910224758.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/toturenoduner.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24818345048.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/29596347858.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/3827760602.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/79411564452.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/mobeki.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/pajedezok.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/ludosumirakegibowexo.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/vetebuxeginenadetap.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/97127011560.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/gowaxogomexudalenoramaju.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_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 10660 bytes
SHA-256: 357e7804b5782902b12b3173faaabb0a1f2f08cfd2b6f9e3d7052a3061752e70
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 17180 bytes
SHA-256: 17a3d642152d2fea08b59e2a35ad53b5d5838fc2f28cd42b8f00474804f5ebcb