Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68b869ecb9f71b8…

MALICIOUS

PDF

70.9 KB Created: 2021-10-09 04:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 02ef39ff5e701fc008aae2bc7cf2752f SHA-1: c7298cd3b76a4b55260f9540f1666d42d3ae43ed SHA-256: e68b869ecb9f71b8df02a026a21c91b029801a6022c28d7ff9457bf62a7c96dd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random and disposable link farms pointing to external PDFs. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The ML classifier also flagged it with high confidence. The embedded URLs suggest an attempt to lure users to download further malicious content or visit phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bangtutrang.com/upload/files/pobanesozexoduve.pdf In PDF document text
    • https://liur-krd.ru/userfiles/file/29808018394.pdfIn PDF document text
    • http://prmakeup.com/Image/files/83849696789.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/87534379919.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/jelewavasexav.pdfIn PDF document text
    • http://hidropro.hu/upload/kemamu.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/2083852871.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161522da76f999---bikudusobojebowatinobum.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/70144399432.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/regonuwuliniwuv.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/lipomego.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/88370543945.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/raturufex.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/10679097566.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/kixumiviwefo.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/84818405916.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/30934030583.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///45080351138.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/43601813206.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/gunone.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/duzowokuvopedabuponelezaz.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6d0acb1f---worugugidikelusikidanir.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109102002037759.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/77533829759.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/68393970028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=differential+equations+method+of+undetermined+coefficientsPDF 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_off0000b559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 15336 bytes
SHA-256: fdbad305df1461a557d62b610749766f26ca3d7a4e8e86ed133795e369e1bf68
font_02_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10988 bytes
SHA-256: 2b0066905c1adbb3662e618a3ebd39560c5e3e4d6e72f0b871f7a381ee49c9fb