Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce355294e8bd85e5…

MALICIOUS

PDF

85.8 KB Created: 2021-03-30 02:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 94816f0b0d7bcfcba8a49aa3a7187404 SHA-1: 8cd9c946c8baec6517f232180788853c23e6a654 SHA-256: ce355294e8bd85e5c1db0fce645b95c3c0aafc46cbd98bc82072f890dbfdb5e1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a significant number of which point to disposable hosting services, indicating a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=wii+custom+themes+4.3u PDF link annotation
    • https://cdn.sqhk.co/kuderoxuz/bkgiihG/55723140594.pdfIn PDF document text
    • https://monibobur.weebly.com/uploads/1/3/0/7/130776122/5026445.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/3ab65ND/zukesuzoditumov.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/japinTY/espn_mlb_scores_yahoo.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/e3cf873c810a.pdfIn PDF document text
    • https://cdn.sqhk.co/vorowobenune/gcfrScn/57971242762.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/8510309.pdfIn PDF document text
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/6964756.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/information_about_mexican_independence_day.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_def53cd850b4435c9ef2fbf83e471fb6.pdf?index=trueIn PDF document text
    • http://diladamosune.rf.gd/birleik_zamanl_fiiller_konu_anlatm.pdfIn PDF document text
    • http://lajixowamimexo.epizy.com/jubunegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0008aaf-2909-4a84-acdb-7fd4105f20f0/76451800791.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_73d7d9c9ffbe4cd59ae06d7759d5802a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/90726431896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78f386e-8633-42e4-be16-345d46262333/how_would_you_describe_a_coniferous_forests.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_11472ced3b33482081902246750c669f.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_56a44294e2fc494a822360047971e6da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd36228-c310-4ef6-a280-6f1bfb21b0f2/daxerisodoperalufozizozuf.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_dccb36a9c7464143b6ca1900d0a0caaa.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 4772 bytes
SHA-256: 67bc4be5c933147d9ee15c23d6016b0fb473121bfa60b99e8dfc14996797ca7f
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 11668 bytes
SHA-256: eeed2a1623f3275426cd90b03942e7832f7a351bc2b1c9866de229605f10b5b7
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
font_03_sfnt_off00013a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A15 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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