Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db09f94bc121ec0…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 10:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2074dd18825ce9bb63bd9d1c07cf67ab SHA-1: 9aada504e4c8a4b62a9cd4d7a45bb6a097e15eef SHA-256: 8db09f94bc121ec0ea795c114226c8c359d53fb978551acee3b28fca1e0279d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or link-farming attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=watch+tom+and+jerry+movie+for+free PDF link annotation
    • https://ksdc.in/userfiles/file/jutofagatugevuwiworoze.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/72901188870.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/94526614012.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/zipejulo.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/68351605483.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145137dd94fc---muraveke.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/75522686807.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/35293972035.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/ladedusavizobazo.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/20318903844.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/12842544103.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/11194653935.pdfIn PDF document text
    • http://didopack.com/files/wudoguvesom.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/29054153324.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/61486081475.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/poriwevoxemogis.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/53547480291.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/xibuludejiwe.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/buzadokaz.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/00f90eb093caf1ddc310c0ede0d5a0f4/51892892191.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/58204995300.pdfIn PDF document text
    • https://people11people.gr/uploads/File/6305940906.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/sotom.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/86186451135.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://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_off0000bc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC78 10832 bytes
SHA-256: 47af9c0878d84efb2fb6b27031fc1b03fe3afcf3f805cf86cfa676807814fc60
font_01_sfnt_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 17560 bytes
SHA-256: 1d472f5c6fdebdcd9be6a432201998afd925c06dd9e3a82e494e2b599d628803

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