Malicious PDF — malware analysis report

Static analysis result for SHA-256 90deec18d5df762b…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 19:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffca459af2adac7a38679bb80f88c9f8 SHA-1: a09769bfd2cdacfeea3ac509a7b481bbf4598bb7 SHA-256: 90deec18d5df762b858330a4fd83b280a48724412fb63572be454f20311b7cac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URIs were extracted, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlighting its function as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=the+end+avengers PDF link annotation
    • http://haciogullari.com/depo/sayfaresim/file/salufuwaxul.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/rapazu.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/99408582981.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/nujorid.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/73031481408.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16139f87396741---zesedemepero.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/92297058080.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158cf07e05f1---gasesewatuno.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/jijobiro.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/tisesutupowujufo.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/juwoli.pdfIn PDF document text
    • http://dsfly.com/uploads/files/noporukafem.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/sumuwababuxulope.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/ralogitunejozokixaxuto.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/89934465885.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/bemulexajumofo.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/56791963426.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/5098090020.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/fuvovu.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/wogonube.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/31655831365.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/velijupavib.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/55364597034.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_off0000b290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 17188 bytes
SHA-256: 747d32ffcb13d451cd60dbce0a124e63da6a945137012eac331c96736cf44e99
font_02_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 10200 bytes
SHA-256: 90f9ba56883f8b359cea2abd92431ad059bb3d8f9f800baf3555410a81b41ce2