Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bd76281243a6f5…

MALICIOUS

PDF

69.4 KB Created: 2021-09-10 00:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92d459d8ebfee2d6dfc1fba5c750eb40 SHA-1: a12af6f6db2336243227251bb826fbb419c9f080 SHA-256: c8bd76281243a6f545bf5e82d10e4c1c3abcd705103b254dae4c1e0c8c10f2a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on potentially disposable domains, indicating a link farm or phishing lure. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classification strongly supports maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/49345344817.pdf In PDF document text
    • https://cheeselicious.net/UserFiles/file/74834356698.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/19595282172.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/71331850052.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/mijufugedave.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/55179566043.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161300010b02a8---tosemugosazivuxagumuf.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/62960732567.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/pipezaze.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/18099571790.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/27858429487.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109070700108094.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/ponapupagaluneferigefela.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/83793187327.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329fd4a51a2---nuxadesakotosaguladipas.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://3e3i.com/UserFiles/file///kivixetizaxu.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/zotujunagilosam.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vobokil.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/dasun.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/logajokalubiwedifabi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/niweluluwuxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dr+fone+wondershare+fullPDF 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_off0000b046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 16248 bytes
SHA-256: 6efd9ec0332eec0f3f61c07115ec0ac5c91abdcb2edf273e8890f7c85feb1619
font_01_sfnt_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 10448 bytes
SHA-256: 736ff8e8ab71687741c1f41969b0d7535d2a7c941d0aa0b734b2f706f21af5f8

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