Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c41962f0b9c028e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 12:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dd65837e4341b1fc863eb79376f13e7c SHA-1: 56a5273bedb33a45bdad42c4d73a9268d9911238 SHA-256: 3c41962f0b9c028eb7418f2fd930347d7229b44b7dcbb10d98878e6a17a7501b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://kasaitogo.com/uploads/files/roxurode.pdf In PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/4002495940.pdfIn PDF document text
    • https://unosms.us/userfiles/file/31727351839.pdfIn PDF document text
    • http://apvn.info/userfiles/file/tigemur.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/57621315464.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/gujanokarirut.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/20874825329.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/jewukitaduf.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/daxevi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/3776713028.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/kasadewixegatorixok.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/kitupejob.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/24384018708.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a4d6002b4f73638039cd56c3467f31a7/jaronevuxuwiligojik.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/88572361004.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/81984358040.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/69732711240.pdfIn PDF document text
    • https://siksp.megarhizo.com/ci/userfiles/files/18209134841.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133421a8c73f---23943111012.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/60092284932.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/xemajig.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/67518048581.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/dopuker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=flash+games+minecraft+tower+defensePDF 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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 14980 bytes
SHA-256: 2e8783b34107243168fd8145bb7080d5b1767cdebcf56160accb2f9a8deff909
font_01_sfnt_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 10984 bytes
SHA-256: 57597498d5e4eea2a34f0225571d9bff81c2b7b239ace9dfc910285fdff3f937

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