Malicious PDF — malware analysis report

Static analysis result for SHA-256 59452d82844ffadf…

MALICIOUS

PDF

93.9 KB Created: 2021-09-19 15:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9c78dcd81ef11904ae131e2dd4cbd73 SHA-1: 6cfebd4c11974142795e057e5b84fe5c981574c5 SHA-256: 59452d82844ffadf323cc04e30a831e8fb40e34918e7f9c76786b41a864adfa6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature of the document point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alamansyria.com/userfiles/file/58064142415.pdf In PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/13716126538.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0c91b65a---kaferumovitowuv.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/visajanexamegevitanona.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/kigiwajolofafosonufer.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/pabodidakunobomabefutori.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/rawema.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/vawasusipiliwulosubejet.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/12724716227.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/gadegikibexiwaji.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914143637.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16142080e9cbbf---68276534612.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/48867286649.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/zexabeveve.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/buzizagidap.pdfIn PDF document text
    • https://kuepancong.com/contents/files/mujosisezumijakabaxujiwo.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/17128808026.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/85316230845.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/mirugituwazapotazupukiri.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/98917648737.pdfIn PDF document text
    • https://tcremich.lu/files/files/zijefitof.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/65387966007.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/tefixafafumop.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/29667578566.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/54826173367.pdfIn PDF document text
    • http://intersonik.eu/upload/files/83788881004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=google+wallet+app+androidPDF 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_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 18784 bytes
SHA-256: 464d6b380d4dfbe1ca5ba531dba761f1be2318a4b1ece9206d154069ca1087e3
font_01_sfnt_off00013981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15198 10524 bytes
SHA-256: 25c4b202fe90f68b21bb213a0716a45645012c1940284ff87e81030a028807fe