Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e17b0cee6548a99…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 11:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: feae09e1e02fa819d8c4c7342107939a SHA-1: 74157011b0e75954c2a1f667735c5974b3365b9d SHA-256: 8e17b0cee6548a9901a60e903334d0a0887793793e124f2a54b99309bc8effa4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1ce38f97---disejesel.pdf In PDF document text
    • http://materialdeestudo.top/userfiles/files/bazosemixakiwerek.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/zibetinanosajonub.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///40579881069.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/37997226211.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/sujevevuviritilititota.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/35312570640.pdfIn PDF document text
    • http://tochuchoinghi.org/files/luraruguborofe.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/parurazawebega.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/12763485872.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/85490582604.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140309063567---zapipenobezigoju.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/97120512554.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/rebinedapalavuwediw.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/89924822100.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/52946807989.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/67867059866.pdfIn PDF document text
    • http://reopen911.info/media/file/tibarutoparejoxuberoreloj.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/sejixefasi.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/85980455709.pdfIn PDF document text
    • https://buyafranchise.org/files/files/sowakinarovewututuk.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/ruwopikanika.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/83233647234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=smart+iptv+download+freePDF 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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 10716 bytes
SHA-256: 60fa385f7e9a47c7afa55050bb18c16da65b73cbf0226b9731f8eccebb7afbab
font_02_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 18568 bytes
SHA-256: cd2c9ccc1551b0ecd451bf2af880f24c0025037bae52cf58381b75f306400db5