Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc4ab3901ede476…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 08:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0049600cf540bf8c58050e64f2b0808d SHA-1: 05f549d1270840414184f04f3e7a44ae0c99c329 SHA-256: 1dc4ab3901ede4762799399559e495741462a742a6bd1cdbe4d6cafe1fdaae09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using many distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=convex+lens+object+distance PDF link annotation
    • https://dongphuchuytai.com/upload/files/14861232197.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/94368905825.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/58393511814.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/51806478109.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/fejizuvemozigotomaxofogi.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/71647373496.pdfIn PDF document text
    • http://hanifeugur.com/image/files/fameba.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/47811273357.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/lofaw.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_968256AF25A18B26.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/76650066538.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/50058946831.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/98678595641.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/zuvakomumi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fcu7b274aqtiuec643ur7ge6n9/bisumalodiritowilozorup.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/38449327339.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/fikesetowajerevi.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/96562580544.pdfIn PDF document text
    • http://cga82.com/admin/File/49344541978.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/56618099233.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/wenedore.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/gaduvivijuwawomiwetegigi.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/zorutetodapemet.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/kazakevisut.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_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 10732 bytes
SHA-256: 5c9518e810a802430cc3c5ab4ea4ba45154c63d80be6d7d2e6b60a0b2818549d
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 16396 bytes
SHA-256: 4722505c9adefdea202380c76d85a1ee28af2c3bb9056e1883ad6ceb429c3735
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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