Malicious PDF — malware analysis report

Static analysis result for SHA-256 e579a7f846bd6b58…

MALICIOUS

PDF

69.7 KB Created: 2021-09-11 09:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af59992a542f2ec1cb72ad68afa6c4bb SHA-1: 35314cbdd939e6d83d3b578d315b8d287e9ad42a SHA-256: e579a7f846bd6b58b0447e7bf23f757e7af1913b66a894ba9f8d60590222223b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically noted as a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to direct users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=transfer+iphone+backup+to+android PDF link annotation
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/870bd8cc06429e6ea60385c969a73200/limanemoxuvufalowuf.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pavifobalofojevapegaf.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/7178202917.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/30204516552.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/18325251237.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/74011816690.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/gokevipobovozediku.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090711322053.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wujofezipapowoxapaja.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/ludobomatapu.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/15755205900.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/wefovexevog.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905011148.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594481498b---36013618619.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/vifajogiviwevizilus.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/fewil.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/fodelolafesajanurebipef.pdfIn PDF document text
    • http://www.toptehnik.si/images/56574491976.pdfIn PDF document text
    • http://irinabailey.com/upload/files/60106631229.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/rikuliwuwozuxomowarezajab.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_off0000af70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF70 16040 bytes
SHA-256: 8c0881b68fee3194562891bb0b5fa6cdf6eeb36ed7a077de0e7481d28af4cc90
font_01_sfnt_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 10964 bytes
SHA-256: 8fca0a75e86a02859b264262840d0b608d06b6b0f6398ffc5a02448763b049f2

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