Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2cc89758eb7901…

MALICIOUS

PDF

92.2 KB Created: 2021-09-14 14:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51be59a60046bb45d6dbab714d23c2e5 SHA-1: 49e7ca075da6025263543e260a1b49bd10f6a4c2 SHA-256: 8d2cc89758eb7901cc0fe2d64e3630f9162a62098cb33ff802519d23e8330305
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of a link farm with numerous distinct hosts suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/35396227804.pdf In PDF document text
    • https://cargotavio.ru/files/file/dafajosakorotateborika.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/20788576695.pdfIn PDF document text
    • https://kueapem.com/contents/files/zolipubabupanerovobo.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914110029.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/pulabidowifavuz.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/rokosowef.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/88890005668.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109020711063287.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc7d4571---9423334805.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/tegezagirukizomediti.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/85728837894.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/48090067288.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/22759077592.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210914154830.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/femibijivaxalugip.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-12/20210912045620169197.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210912181051.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/vobage.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/figepowo.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vixepozop.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/72821012967.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/74405881430.pdfIn PDF document text
    • https://cooperspick.com/files/70322414946.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccd93ee2e---nutilulowidowulajupajami.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/8008430827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cricket+ground+circle+sizePDF 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_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 10664 bytes
SHA-256: 2bb45df1fd3e4279bb4a23ca77798980cdcec738381a4f825b4c8b95cc2e3143
font_01_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 18052 bytes
SHA-256: f498e3388dd693405d7029fcf2423504fe4e647004d8f9dd66dc3044e198322d
font_02_sfnt_off00014b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1