Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5214fdfd05b742…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 06:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 308947fc74ad59f6da904be2f6c79da4 SHA-1: 61be97cb47fa9556372c6ab502f976c2ed531d3b SHA-256: 6a5214fdfd05b7420b1ccafd2a7294ef2a699ec9d4e07389ea7fae66836c1474
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 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://irlanc.ru/uplcv?utm_term=central+toy+shop PDF link annotation
    • http://tjsyjdq.com/v15/Upload/file/20219171757301666.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/jomegefenaleronew.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/49555791089.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/nubexesagatasalel.pdfIn PDF document text
    • https://777mto.info/contents/files/39139160386.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/tizekezakezofirolalibibo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/vitewuboramopobuwisi.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/repunevofudufigakiwi.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/keloxebotuves.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/82902729289.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021092619560078.pdfIn PDF document text
    • http://matras-devison.com/upload/file/30293231222.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///2477094627.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/99331810237.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/sexufexupozip.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/26043309952.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/jufojawutawefoguba.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/73888473950.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/48377818616.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5bkj0vb0ef0onia95iaerrn85s/mupus.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1ff1aba4---gijufunepezorazoxajul.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/82637915762.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/47936792009.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/62911429745.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/gipogebawoj.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_off0000b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 16208 bytes
SHA-256: 4933c13ff1a508749c791e20b0cb181040a50401b2dfe7dab9d04445204c3dc1
font_02_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 10404 bytes
SHA-256: 2f284d42dcde10d06af9a58f08de7330343033c65fbfb4ab5f5291fd120afe35

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