Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2253fef83d81a5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 21:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6777d73e6c8f20c42e88ee205e34a4dd SHA-1: b75be9b5d0aec1b63c06c08a8983a39ccb0399d8 SHA-256: 1f2253fef83d81a51ecf0bbe5046dc2b2735d7b855561f58438dd71964fc889c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archism.ru/uplcv?utm_term=mobdro+for+android+2021 PDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb11253270---jetewema.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/razofuxazamebenut.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/11640240703.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/22920865331.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/40882545937.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/vojol.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/50736184888.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/21499581958.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/maxikadupepokogadelewu.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109110028152398.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/17302307329.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/tirivadu.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/nuvoma.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/82012172486.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/puwolozidevuwiruravop.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/92719883687.pdfIn PDF document text
    • https://seerupit.dk/assens/file/1169528058.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/94878996502.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/65113207725.pdfIn PDF document text
    • http://m2m2design.com/userfiles/xavekadiwufijo.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/bubulivuzifigawovenimuv.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_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 10332 bytes
SHA-256: 7f0df6d613aedec98ef7f73a5f414f2873c4938616faccfe8d9208ffb1b32617
font_02_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 17340 bytes
SHA-256: 6661bf1adea8d5094bb8c31160e304a8e2461a2f116651fa8a970b91e9e10bf3

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