Malicious PDF — malware analysis report

Static analysis result for SHA-256 b468d33afa137494…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 14:15:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d3ced34671885f990a390740b960d8f2 SHA-1: b0dc6dfae01cdac578effcea94624d7291813035 SHA-256: b468d33afa1374946e9c43632103b28d11d6978657886ef3c4a22fde232612eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/wix?keyword=3.4+cycles+of+matter+worksheet+answer+key PDF link annotation
    • https://dekamukovesu.weebly.com/uploads/1/3/5/3/135324216/wimogumenujile.pdfIn PDF document text
    • http://usesalon.xyz/903688734944rwt5.pdfIn PDF document text
    • http://energierecrute-emplois.com/jafepasajimevazuga8q6uc.pdfIn PDF document text
    • https://gifuliranofave.weebly.com/uploads/1/3/0/8/130873810/4692e3.pdfIn PDF document text
    • http://shoppermarket.online/data_analysis_software_free_full_versions4ftc.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/oIhbBih/8898657997.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/XCy0Thh/tenkuu_shinpan_sequel.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/cijhhgh/teppanyaki_buffet_anaheim.pdfIn PDF document text
    • https://nidedijuba.weebly.com/uploads/1/3/0/8/130814831/saxuvir.pdfIn PDF document text
    • http://mamontov-net.cc/222688604451cxvd.pdfIn PDF document text
    • http://filemarker.store/24723827792chazn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d5ec9b0-e477-454a-8b5c-3b26e9598c92/jatugerokesukediwos.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_b7d2518577684a4d9565d16161d0d883.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0344c9-90d8-4228-abaa-ab56d99138fb/esther_ahn_kim_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/xuligafubodujexel.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_dff2e4c18c5742ad976751f5190255e3.pdf?index=trueIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_722fd254469c43d181ab92cf575f310d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/area_of_a_right_triangle_worksheet_5th_grade.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_ced5b63cc9414e17a7b158e273ff8193.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dujepav/gezigirovinorekoxojuvu.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_bf1e60218932440eace739206bd72f55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d3aa714-0b65-402c-a19c-febbc038ebaf/56469293639.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 5568 bytes
SHA-256: 4d13a3c9f1712412db07dec4489ef91e5b19d123354bcca93957569994661c90
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 10876 bytes
SHA-256: 8c1c9a55b7a355b0189d6a7e2586040ae480c2d4c909af7327a859ab2cbec836
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 16132 bytes
SHA-256: 173e74cb656ce8cf62e9dba6189377201a248cf59bd5f118deeb5932e9a17b3a

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