Malicious PDF — malware analysis report

Static analysis result for SHA-256 878962d383979d85…

MALICIOUS

PDF

94.7 KB Created: 2021-09-09 11:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 828c159e0978f581df376c5f81ef7044 SHA-1: 1cf282358df0555f7a94ebf43fe39da62fa8ce73 SHA-256: 878962d383979d855f00c643cbfd5ce64c203b21b771bc115523bdd83a05d88e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely involving a secondary payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://smidgel.ru/uplcv?utm_term=game+of+thrones+yts+torrent PDF link annotation
    • http://elma-itc.ru/!upload/files/93549259786.pdfIn PDF document text
    • https://siroyensao.com/upload/files/21870097801.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/40311493215.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/23670723692.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/76485505694.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tavuwirojamuzi.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/zotiwe.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/61253849276.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/37296733763.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/lutorejogovute.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/vesekewesabevode.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/masebaduw.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ixutamukegiligekedi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc635e6fa2---wojivuxibegi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/10411455122.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/rulanulubazigegimav.pdfIn PDF document text
    • http://mcutech.net/files/32504932910.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/53415857104.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/fiperodesemugajazef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c23314a7---digojumevabutowizum.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/41346517881.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/bazumarosovuwe.pdfIn PDF document text
    • http://lobi.md/userfiles/file/rigamaliluzivipijiwix.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_off00010b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 19148 bytes
SHA-256: 0520c31f3239cc93706c1a65897e04a87a0e49e0161dc5770664c8477d987d74
font_01_sfnt_off00013d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15533 10496 bytes
SHA-256: 27ff346bf43029deb8ff63676863bd296ac23d9dc9bbbbbc25dbbf22423dcc7f

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