Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09ef462ce3b1d8a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 05:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff702fb8783ba2fa652fb797fe67c69a SHA-1: db00a6014ff53a4bb5a1d6a2e5a87fea7b6774fc SHA-256: a09ef462ce3b1d8a0234b6ad34ab75958a905700fd32df3f92e15a04aaf4bd4d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 4

  • 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 http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161400c817502c---74232195648.pdf In PDF document text
    • https://semineebrasov.ro/printuri-fi/files/92010825219.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/44937314833.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/34938589833.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/suzozu.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/96773449680.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/1385673097.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/ramupevojipuwijefonivejoz.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/42426496270.pdfIn PDF document text
    • https://kham.vn/userfiles/file/tiliraposupilefotajoratel.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/42551275838.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/popifusa.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/11258901490.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/79170262127.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/82790449127.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/9151558113.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/72609783077.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/jetofulaperigapugi.pdfIn PDF document text
    • http://air-con.ru/upload/files/21194811521.pdfIn PDF document text
    • https://cartolmania.it/file/31163709882.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/1129743718.pdfIn PDF document text
    • http://lobi.md/userfiles/file/91287577570.pdfIn PDF document text
    • http://midospa.com/upload/files/bofolawonuni.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/10892762926.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/75493148704.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/72461927117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=la+consolation+2017+full+movie+freePDF link annotation
    • 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_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 18556 bytes
SHA-256: d906af9e34687c2439a37b0ca156ef4910fb03351982632882c5f955e9e17ca3
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 10964 bytes
SHA-256: e030d1bb1b3dab1f3446e3854e0bf4d2463dda1ad2a5428943733148b64a18fb