Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce843e24255ca1e…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 14:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4603b81a60ff12cf0f527d0528a2c3ba SHA-1: c6ddd9139a39d9515e50b866003040aa8eee1f0e SHA-256: fce843e24255ca1ea9d53c22bb75cf700c27df9013efd9e42fd6efc0c943afd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to link farms on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to redirect users through a network of potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://simondaulte.com/ckfinder/userfiles/files/besimorameb.pdf In PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/14422962102.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/62905449311.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/84524978798.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/kugevotozafotimabevomow.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/29374588025.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/fadivoduwavanilum.pdfIn PDF document text
    • http://dongphat.net/upload/files/vatomigefavisuj.pdfIn PDF document text
    • http://ttc-investco.com/img/files/wemegukiwakapi.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/87709535718.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eec772061---notomevalajipot.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/goseg.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/91482955592.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/negawuparutagabedalejolid.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/navujik.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/35963544667.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/pofajiweku.pdfIn PDF document text
    • http://ativn.com/upload/file/81810471012.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210911223624_3orgo3.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/bovexuvaxomewof.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec920b20c8---47077095977.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/86810490072.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/86721571719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=game+nombor+1+di+playstorePDF 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_off0000adaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 10900 bytes
SHA-256: e693e85ce75f302aff96f3b980af66f15dae69aeb01507d24d01776c6a6ed91a
font_02_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 15420 bytes
SHA-256: 5f2dfd458a7a1ed1cb8cca2dcb4b6f6430c55305873bd4dcf98d76cd283feae8