Malicious PDF — malware analysis report

Static analysis result for SHA-256 5518c2ad6d9e2b6d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 23:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a4d18d0b8b76a60b39a07a5432649fc SHA-1: 45c6f8e58f0058371ae982f2b80870798615b43c SHA-256: 5518c2ad6d9e2b6dd627c460caa0f279f12778fb72474927a6546218e823e4ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The presence of multiple unknown URLs suggests an attempt to redirect users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/96132693667.pdf In PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/nabofoviz.pdfIn PDF document text
    • http://cga82.com/admin/File/lajizuvelom.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/65161004713.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/walewimaxafinabapubiseb.pdfIn PDF document text
    • https://anfauglir.com/images/file/92948592942.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/31544775552.pdfIn PDF document text
    • https://raljob.com/userfiles/file/6646838611.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/ponatinugezetabizubiselub.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/gabusafupexos.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/vudarusiwonamojexifubel.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/1053132822.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/30770868223.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kumusepofezof.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/14381834108.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/27013463772.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/faboxikesekivu.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/tovufefagilarevomiku.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/80547668775.pdfIn PDF document text
    • http://secretinvitation.net/images/files/58756875943.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/fopega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=google+chromecast+kodiPDF 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_off0000bb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB66 16508 bytes
SHA-256: b0fe1d85abb7440aa0d5ac2f471cb3100b8231a95cbf446012680dc335ade3dc
font_01_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 10844 bytes
SHA-256: 999f1b2213e74be648d7263e55aceb06d697bef2a557da0a5feee1d2d0a00ccc

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