Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56c1b1c80c512c5…

MALICIOUS

PDF

68.9 KB Created: 2021-09-17 10:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a27bee29142420bd8c310b7f38c6ce62 SHA-1: 190e433a2907dc844d1e333752aa2222a70cec3a SHA-256: b56c1b1c80c512c5d9bcd9e5ed30e9a3b8a11f3a684df7da17ae0b71a7f32ed3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a link farm detection and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting an attempt to redirect users to phishing or malware sites. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://limsurempat.com/contents/files/52867107645.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143d8f8013b0---21202573233.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///guxifunod.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210906_100040.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/57792187317.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/toxoxemexiwojitos.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/pegewuwosarasenasalogomat.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/banekusorot.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/28042644179.pdfIn PDF document text
    • http://ned.ru/uploads/files/59379561101.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/wezuberuzoxerajo.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/31099426523.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/pifuxebipiruvotosarom.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/xekib.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f3ae93216---tobumosemaso.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/vowewasagev.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/32358364836.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/42517533081.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/firuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+uses+or+overrides+a+deprecated+apiPDF 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_off0000aabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAABC 17348 bytes
SHA-256: 65e8151f4d5c063ba2146c78848f08bd94e4fd7094c69b031f642c395fe9cc36
font_01_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 10608 bytes
SHA-256: 88ae767e89aac66ed6b8e74eae5f463d4965fe19e8830c0e5eaaf21aba1deab3
font_02_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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