Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d0846755bd24ef…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 00:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8209e9f93112d8b4c925ac6d7110f5b SHA-1: f416a6d599a7b0361d462759a2d5f7209c978a48 SHA-256: f2d0846755bd24eff663654c201159cfead7aaa368f8722dbef4541b01bb9646
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, and multiple external URIs were extracted. While no scripts were explicitly found, the PDF structure and the nature of the extracted URLs suggest an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vargyasnekonyveles.hu/kepek/other/file/43541836641.pdf In PDF document text
    • https://yunglin.com/uploadpic/files/mozonalese.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210916131724.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/dilapolabiv.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/likaruxabig.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/musezakasulixi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138c616e3fe8---motorufagob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f582446e99---bagidonizu.pdfIn PDF document text
    • http://www.bash.cl/media/file/99750679197.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/83087149953.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/dipamaxagiledobiri.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/38892989164.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/lelomini.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/2340924990.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/48630178816.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/05/file/20210905_025806_152.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/62551338235.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/29672614658.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/22227334288.pdfIn PDF document text
    • http://congtyvima.com/images/Download/xozaxojifimu.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1964344763613630c410d43.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/80470664782.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/17400507707.pdfIn PDF document text
    • https://hinaweb.com/upload/file/kefubejutagenuvujawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=real+free+fire+diamond+generator+apkPDF 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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 16824 bytes
SHA-256: 83c8be53265f6b961361f24ac9c44892bec3dcf931cf47e9c5cdedf426abb8cd
font_01_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 10808 bytes
SHA-256: ba3fe7ade31483c6b26f07b52520159dfd7bcefca2ccb415b4e7d9c813f8173b

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