Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c57298e13c632b…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 08:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7dafce941edd6d1b9a5d9dd19cb46392 SHA-1: 0c2bd1aa8cfda34ee9cfdd1585404707b7ab322f SHA-256: b2c57298e13c632b53d5a9af3e547a018541ec460cb04523f0c276a58d649909
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://washlounge.in/ckfinder/userfiles/files/2605963569.pdf In PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161391cebc4be6---57643881777.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/65288300664.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/61239848531.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/51523989096.pdfIn PDF document text
    • https://oasis-travel.ro/files/65177870192.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/93781325656.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/bafis.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/xukisusuxerop.pdfIn PDF document text
    • http://linza-market.ru/upload/files/36719625615.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/1628541664.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/10664407969.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/gojimigusufiwivure.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/80189731797.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139717be32cb---lelebi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/84153176317.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/wisujitasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=creating+android+app+iconPDF 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_off0000ce11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE11 10508 bytes
SHA-256: dbc2f16cbb69b26527fb39b38ace052de39bb2f0d5d6b0acde22243a0d38b3a1
font_01_sfnt_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 18008 bytes
SHA-256: 70f6440357000dfce446b892acf13270a441a97e249c51f4ec126f4685f4753f
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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