Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc055c1e0caee20…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 13:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f734641456f27fd40a19a1e7ed7b7f0d SHA-1: 1c255c67f7e338e04ccd8e986748030c3d9e948d SHA-256: ddc055c1e0caee2043a2a8afc6e18da5bd79cc50a482010ee67e59035e915b62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da27ab1b16---jusijazositoposizuvaja.pdf In PDF document text
    • https://duragloss.pl/userfiles/file/71488541531.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/14527545118.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/46355768131.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/5667030865.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/67808761725.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/nerumuneg.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/zozisiparamagovofoxomud.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/15242229331.pdfIn PDF document text
    • https://forumsevens.com/images/file/43423895611.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/dabapidifaxesisewe.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9612c3d6---bezabatazovot.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/64097990743.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/26825214359.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lipafudada.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/temifiwuba.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/denaxelugowixowo.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/funipogujasasaz.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/bivewabeziluwudimisujuruk.pdfIn PDF document text
    • https://hsse.cl/files/redorasod.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/72701975395.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/91577940833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bubble+game+bubble+game+bubble+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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 17336 bytes
SHA-256: c7337f1fc9afc17433a8a1369ba302cc74b1aad4bed8a7d2a3f665b957474f25
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 10064 bytes
SHA-256: fd78a18b9d4efa22153ac474c4c25b22a9657fefe4e30de1e429d3af6ed9ea96
font_02_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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