Malicious PDF — malware analysis report

Static analysis result for SHA-256 557c62e9db260e7b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 10:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4221cb2c8d0ac78a51c4edf212132c77 SHA-1: ca7db4a0346748fe141f569b568446daf3df8342 SHA-256: 557c62e9db260e7b23b69a7ced9455e8f1c1c1f89d9cf6a5628019f16291d742
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of numerous unknown URLs suggests a broad distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/61428412302.pdf In PDF document text
    • http://metabolit-plus.ru/files/file/1186629133.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/felulinolejev.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/40183044904.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/sekerijegitefobusasiwume.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/5636808868.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/jukufaxikaripalovewikajo.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/dawelesunogafesutarogup.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/pazitagam.pdfIn PDF document text
    • http://kunbot.com/upload/files/golebawa.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/guvilimo.pdfIn PDF document text
    • http://fullx.net/files/derejigabupef.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/wuketixov.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/13479207924.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/7899112381.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/55863530282.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/66307277785.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/voxetonozibaf.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387b1e1b73d---fagosexosorozejunedefu.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/lemikulajogitimolareke.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/77460175031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+apps+for+developerPDF 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_off0000d31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 17764 bytes
SHA-256: 57e3d104e2d6d39e318b6d5546db30abca2aa93feb2248313d05b579c5951732
font_01_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 10440 bytes
SHA-256: 963efe5535c06c861e371bfe864c93f2c0c01a74f5f319001397ad10b981f012
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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