Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df97d662ff28c50…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 02:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e56747cea7c2b87f6ef5331320de71f1 SHA-1: a3975ebf9a8f11b705262aa945635992f8a821fe SHA-256: 5df97d662ff28c50e8350dce89299e038546db6dc1b2dfe4e1e33fe0cb5d8d21
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to unknown domains and are likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/zukajibuderejuduwizema.pdf In PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/tolozazigod.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/vewotikirisewifi.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/72726536927.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/62833220091.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/14514577747.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/pisubevotivam.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f576ece6---86845471813.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c50ba4e8de---muxumuwaru.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/84480993325.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/48925160680.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/44221431085.pdfIn PDF document text
    • http://apcmagon.com/userfiles/vuxoxide.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/fadiwiwafenivetivaj.pdfIn PDF document text
    • http://gocash2u.xyz/userfiles/file/wumesemijebulade.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/tibinitejefadaj.pdfIn PDF document text
    • https://rajakedua.com/contents/files/jekojuvesasane.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/34912050561.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/41980699624.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/69642357371.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/97711034376.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/24553897876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+galaxy+s4+android+developmentPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/jizunuf.pdfIn PDF document text
    • 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_off0000b178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB178 11268 bytes
SHA-256: 289e6db87e1204cb253c8cc87a1646ba98f35a59a175c00b0dda70db2de5853e
font_01_sfnt_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 16376 bytes
SHA-256: 791916790ab4803a43a765e00d467032c43d0f6ae1837009e6823335814adcc2
font_02_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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