Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b294f06618bf12…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 00:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 543890e01cd82a8ba68966476a405232 SHA-1: 0b15d0edc9e06e107628e684f313e53d7e5402ad SHA-256: f9b294f06618bf12cbc78f21954caaaede572284c922fe6452bb53427c4c2a84
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous embedded URLs suggests an attempt to direct users to external, potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wonikquartz.com/upload/editor/file/1631562008.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/86326295189.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/31285179125.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/dijupiroseg.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-4/20210904084829919486.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/ruxutarofutusedewomekedev.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/36556005564.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/kedoraxuvotuduwuxiwa.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/89405037923.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/rapavafesujasezudane.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/93532077066.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/74434427362.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/48855301342.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/zotasaxiz.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/noredizo.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/8532809181.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/21854513260.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/jifurogivibowud.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/89457882732.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/ditezi.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/vaxak.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb25ba8489---74588947557.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9a66d3684463fe59eb20f9e962c8e084/nerifira.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/59593915730.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/43985080838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gta+los+santos+summer+special+downloadPDF 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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 18080 bytes
SHA-256: 8f3ac6c8721974cd407af2ff53f1943f33c6f816f874a79a1445c30d7ffa25d8
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223F 10900 bytes
SHA-256: d8c20882dba347b34a1b330fe0928531172836da69ce46b4689b42b2d252e268