Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e79996d8efbf87…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 11:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5eeb651249b388b5c3180589dca7c587 SHA-1: e5c4ca7e09dcb9b7260fd0d9a9b300b700237fcd SHA-256: b4e79996d8efbf87ccf08eb5a33cdecda87315c6e1fd800776ed2ac3c198805e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains, likely to distribute malware or conduct phishing. The embedded URLs, such as https://smidgel.ru/uplcv?utm_term=xiaomi+poco+x3+nfc+vs+redmi+note+9, are consistent with this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=xiaomi+poco+x3+nfc+vs+redmi+note+9 PDF link annotation
    • http://olsztyntransportmedyczny.pl/userfiles/file/63836109929.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/jovevem.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/tomakabekunapimurawuxig.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1saipu2g93uqt8tq97brlk5d61/26690958443.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/58419049496.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/12065496948.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/penesejigow.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/64513910963.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/vojegugekug.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/78458550970.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/82327505772.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/13527892318.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/57309032898.pdfIn PDF document text
    • http://asfalon.com/__files/file/lixowelomegari.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409600c2e62---13049733392.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/zurijewoxosazuxob.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/tifegitalotagiside.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/90784246280.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/2144056306.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/sosibelegejejaponopone.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219191944555056.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/23666198704.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/13800605961.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/2410661880.pdfIn PDF document text
    • http://holzbau-napetschnig.at/42556077079.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_off0000b113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB113 16060 bytes
SHA-256: 7a430d2f9b813c7f3ccde2c364b85672612e79943bcb8149b2ff01c07b4a03cc
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 11252 bytes
SHA-256: fd34da5f4c05a1ba156580392427a4b113dc2f68c5bce83be1f434aafddb2b28

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