Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6556ad76a7085bd…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 19:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6107f080d090f83deb8ba4d6ee63f76f SHA-1: 66e82b7d5002a7f27f1f9c9787949a31c898b99b SHA-256: c6556ad76a7085bde683c45a849b08854e43b0af70fc6b1d595858d854b510a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure suggest it is designed to redirect users to external, untrusted content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=grand+theft+auto+64 PDF link annotation
    • http://kurier48.pl/files/userfiles/file/zotakowipanujo.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/vudaguwiwaxibek.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/garajawidu.pdfIn PDF document text
    • https://designclarf.it/file/88336031031.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/janoliwugavujepiloridez.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cd546450e---rimosofowumixamazuv.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/47785039188.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/50349731989.pdfIn PDF document text
    • http://byecook.com/ckupload/files/34581642406.pdfIn PDF document text
    • https://bfull.ru/uploads/files/zanawalat.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/m0h287gslq41gh7li3cuatn876/71996322709.pdfIn PDF document text
    • http://fteq.ru/files/file/41848290840.pdfIn PDF document text
    • https://krusomying.com/data/file/2474822154.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/duzunigarewuvesabib.pdfIn PDF document text
    • http://contelex.it/userfiles/files/64594555953.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/26273883337.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/99814619961.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/javirokagugoleropasofenu.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/nizalad.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/97033585628.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/31270143893.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/suduwemefutepoxidejanot.pdfIn PDF document text
    • http://kahasat.cz/data/file/gegimefad.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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 18180 bytes
SHA-256: 7c3ef9a61f0eb1fb074fcc4d5c0c8b7c2cb60e9719a2753270545433491bb185
font_01_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 10528 bytes
SHA-256: 7230113ccd8737be882728d9409c774db0417604969323a103f82f298ae1baad
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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