Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dc751bd36dac0c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 01:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70f63ffa0b136f6a1a71cd5d987b1655 SHA-1: dc4a7f6f3cc012a77583741316b8deebfd65693c SHA-256: 43dc751bd36dac0cef6df109ea643aba790aa3381ccc8401f6b7ae9407c7f510
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded URIs strongly suggest it's used as a lure to drive-by downloads or phishing sites, aligning with spearphishing attachment tactics.

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://allytemp.ru/uplcv?utm_term=dangal+tamil+movie+download PDF link annotation
    • http://sunnysolutions.it/uploads/assets/file/19825817044.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/81732771165.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/sukijegedibaxu.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/loxozeberokobekowenigu.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/26182319488.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/nakaj.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/luboga.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/66144974875.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/99265309983.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3e823df6---levosuwofujodibusubonones.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/47935181692.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/vejagarafezeguzedu.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631740120.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/ragemodidisamegum.pdfIn PDF document text
    • http://chongros.com/userData/board/file/zemoponerefefeso.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/widadotubewelatuduwok.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/najeduvadobofori.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fufenugorikilulitesenig.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/65213091046.pdfIn PDF document text
    • https://kapefashion.com/files/files/lezadimibid.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/46674953133.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/77789387283.pdfIn PDF document text
    • https://digireg.cn/upload/69069889266.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/969a0aa5f24b7e0504d660fba205337a/lefemalevizowazuvamopejo.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_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10476 bytes
SHA-256: 379715da2b9bc1dc015b8d4896bb5e2ad386c8a894c2f00784007ad4886bf4ee
font_02_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 17524 bytes
SHA-256: b612e25c60865f69f4bf6e19f87366f62247394fc1013bbcc0048b295c2c9d45

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