Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddaaff73cac5293a…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 12:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d85c7b7e85dda5d1128d57111930d398 SHA-1: 2d4e3d26acd79eec0a6628c1be933b9f7f5a25c7 SHA-256: ddaaff73cac5293aa40f5f9d8ef9429deed6a34b2dc8c8241e626796db135d88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=bike+games+free+download+for+android PDF link annotation
    • http://msslink.ru/userfiles/files/tegowibunaxadixub.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/14814819626.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/mukeluzigutuwekugi.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/lojojod.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/45859769021.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/30891434527.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/ratemag.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/zalota.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/gesekelofagatofanovez.pdfIn PDF document text
    • http://novafish.it/userfiles/files/52001920074.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210912181011.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/64259020787.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/40902307769.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/30294122280.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/fewodirolu.pdfIn PDF document text
    • http://movediary.com/userfiles/file/gifatubewefitimaw.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/dejefutulikujebu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0c0090db8763fe0e158c22617d921c2f/buzanekirira.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/53779423991.pdfIn PDF document text
    • https://cncunse.com/d/files/1101686186.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/28796531011.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/45119444269.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/68987338069.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/54575948552.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_off0000b70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 15232 bytes
SHA-256: 2f409b8dbf2669a6150fb681fe30e51228a04753965681d7a850a349c35fc7e1
font_02_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 10828 bytes
SHA-256: c22f30782e3380a3e717118f392d01808e5da9d13f4bec3d51c16d4532a824e6

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