Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c433a94ddcbae4c…

MALICIOUS

PDF

100.7 KB Created: 2021-09-16 08:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 807523d4659e0cdce2866a577c0f354f SHA-1: 5a7e710c91c4c3a734063ab062a0d8cc8bbc5b6f SHA-256: 6c433a94ddcbae4c3858d4a0856a4548c6fb10de6f3cf6e483d766352c690b15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to phishing or malware sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://truhlarstvi-strakonice.cz/files/file/jidetunajilekevopow.pdf In PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/78886719447.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/38391215463.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/dulejonopejanejidemijon.pdfIn PDF document text
    • https://brakos.it/file/lelutobuzanusipesadifa.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/83600089328.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/70261368369.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/13608813749.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d11838a979---35869061829.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/mizifitosobuluwub.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/5092913550.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/wegumivajidutumuxesasi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9084b0564---nawebamokopufu.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/nevixujurufozepimujiboka.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dubisanojabuwa.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/3950680073.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juvipalogufigadelexone.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/12315954919.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/12906394813.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210915_223232.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/10382359405.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/takifapotuzimusiwowapeva.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/22666871443.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/12545530543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=22+jump+street+free+moviePDF 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_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 18736 bytes
SHA-256: c8cfab8ad41245ad8740f6d66c0918f4184dfa8d51d4dd1664dd2bb4248a4188
font_01_sfnt_off000154ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EF 10524 bytes
SHA-256: 2b08b736f36a653e704281371a00a892d0e58e6800a3d1b62e68b482f02f9a91
font_02_sfnt_off00016cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1