Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6365ed7ad13b50…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 17:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 589860424636129038cf474ae11ea0d2 SHA-1: 05bb77799eb89497908006918a21888e5ca5f2dd SHA-256: 9c6365ed7ad13b5030e17c420abbf7e94fc19da87674ecf52689c3a768e24e85
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one pointing to a raw IP address and others on disposable hosting with UTM parameters, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristics strongly indicate it's part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=activate+office+product PDF link annotation
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/97398955096.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/61903088149.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bisesopufemudiwibubejitoz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e15dd10c---3345270789.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/70214846758.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/41365848371.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/76992986395.pdfIn PDF document text
    • https://kapefashion.com/files/files/nusoxitagavonemenozom.pdfIn PDF document text
    • https://superpart.com/files/66035009241.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/56641102455.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/nuwotegijipovo.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/13106893392.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388a3f9f6a4---78904071268.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/sunuvupotar.pdfPDF link annotation
    • https://annekienlen.fr/imagesfile/31547572109.pdfIn PDF document text
    • http://rococosofa.com/files/files/30481527478.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/61985465348.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/68938907878.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/83800228785.pdfIn PDF document text
    • http://bdn10.cz/files/file/42322494551.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/99162598752.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/80351601441.pdfIn PDF document text
    • http://orderkai.com/uploads/files/47518428796.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/zinep.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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 10440 bytes
SHA-256: 473b736ef2f846cb8faa7bea166aee35c9080087a513858b08d9c1e31e7f46c7
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16760 bytes
SHA-256: 27648eddae1267f92315f47f3bed5e13249f00d177dad5d0056fe2671df6f165
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1