Malicious PDF — malware analysis report

Static analysis result for SHA-256 7459bc6d494842e2…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 18:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 957659c237eb2801e1458f155a05fc83 SHA-1: e6bd527b61da05f2b26708831c2ffdaf0552d90e SHA-256: 7459bc6d494842e28410e91050111ddad5fc10fcf3df850839c429eb080330b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution campaign.

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://allytemp.ru/uplcv?utm_term=og+youtube+app+free+download PDF link annotation
    • http://accessiblevehicleservices.com/userfiles/file/39437402818.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/80855685217.pdfIn PDF document text
    • https://mar3ol.com/Files/files/50508329255.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/gavemawefesipugumezusexo.pdfIn PDF document text
    • http://castel.lu/userfiles/files/77082494607.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/pugifa.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/31706375591.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/77758114593.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/73116592462.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/besizarotonifubalajupa.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/94807004262.pdfIn PDF document text
    • http://cncsprings.com/d/files/sanowipitubomememod.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/zazijojinaloja.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/modapaluvulike.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/siduromoxuxozefeguwejepeg.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/16624738498.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a329de93c---71642469046.pdfIn PDF document text
    • http://ranchobg.com/img/file/6005072463.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109062246103812.pdfIn PDF document text
    • http://strandedtattoo.net/file/95420729044.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/laniwozaroxadimejo.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/zafuvilovewusawogeti.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/kesofalosemexomukixa.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_off0000ad6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6F 14808 bytes
SHA-256: 41c108f2272f1283e7574325c05917ed87836a67747486152963aaf27492ed71
font_01_sfnt_off0000d2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 10880 bytes
SHA-256: a40a455360b2932d59affc21e3562d21bca82e6c38a31abccdbc0a78db9dd20e

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