Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d15fa5fce2eb4c5…

MALICIOUS

PDF

94.5 KB Created: 2021-09-17 03:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c9b6e408c440b4125b354dec5eb78bc1 SHA-1: 00ef984424313bed04be95f782868bb677ee1365 SHA-256: 5d15fa5fce2eb4c5785038a67453425eded84f2ce39c589e402c765a4c696c6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous external URLs, indicating a link farm designed to redirect users. The PDF structure and embedded content suggest it's part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://synerhu.ru/uplcv?utm_term=best+graphics+android+games+offline PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jovoxuxafenomimi.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/raberabamamuziwopapop.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/52769816535.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/56642453747.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/naluvilomofupojupajemolak.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/80974957610.pdfIn PDF document text
    • http://yuha.be/_files/file/duvuvogivarabafokok.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/wigedukokoponinagu.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/22520166695.pdfIn PDF document text
    • http://contelex.it/userfiles/files/83604828011.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/97366456213.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/9415065843.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/07/68727490975.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51800364164.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/75716803953.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/21675146497.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/547442792.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/18720100166.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133e59323f34---poxabujepi.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/54435673225.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0eeb0c48---disodafakukibumidupuzus.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/sesinarojoma.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/96169984776.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314129763365.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_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 17388 bytes
SHA-256: 498b1821f397e188510aedc36d3bb9614a6ce10f0eea17bb9f859f5eab32ee32
font_01_sfnt_off00013aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C5 11120 bytes
SHA-256: 879b51f9e5675c0d9d8b36b840928bfc77e0ae9848551da70a9a9a197361e8b1