Malicious PDF — malware analysis report

Static analysis result for SHA-256 109c4bb39b9b6587…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 15:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a26420a6f1b3dd00ec03fa6ca3f8066 SHA-1: 2be06ab30f203cfeaba817e141987337f024b662 SHA-256: 109c4bb39b9b6587ea1162e170dbabcf113d9e2a037bbe4130d6fc84a208cf2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous URLs, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://braus.uz/images/shared/file/rewegolanajofegotojozewax.pdf In PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/lawepusejoxemoserugokedi.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/75504278332.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/37800486578.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/maluzibad.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9fc12031---34602645741.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/xuworejefurogiza.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/mijedopowogomotul.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/sivazuzi.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/52702336740.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/zerirulegotapisiforafed.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/vakizamiwujilulaluvimewum.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/77379984562.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/11545030955.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/93091042602.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16309359462147110524.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/25624571111.pdfIn PDF document text
    • http://master-br.ru/img/file/sosezaweloguvofujet.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/89651950236.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/53090372269.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/vugasanelasasakuwutuxerip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+recover+deleted+contacts+from+simPDF 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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 18588 bytes
SHA-256: 37bbbc042d1a78ab7685e3321398161960c058790d8f23b11c0a8b7205c30dc1
font_01_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12458 10780 bytes
SHA-256: deddff1e344d434a7d57462afc258e0b14166b76e2c3cc4f12863be8dc3a2091

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