Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de5885f42eea08e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 06:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9bd1d42700ea728ae838eb8443f9df6 SHA-1: d86b37cdf0c91a0650762cb5a601cce702601b40 SHA-256: 9de5885f42eea08eccbe99283cb75832e685d0bb3cd54be939390a6af982fc48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a malicious intent to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=how+to+project+your+android+phone+screen+on+tv PDF link annotation
    • https://perfecthospitals.org/ckfinder/userfiles/files/53719997639.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/gepugemituragubozifalif.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/54697554766.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/56274943470.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nixabewezamozu.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/82757963880.pdfIn PDF document text
    • http://denge.aero/upload/files/70483866957.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/47258756852.pdfIn PDF document text
    • http://www.bash.cl/media/file/94724940553.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb481cce4---22030948981.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/23433793969.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109132215363365.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/zadibipanuk.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/moxurozovexat.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/95673184094.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/lagemitaxu.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/zidojarijifilogalegowez.pdfIn PDF document text
    • http://gptools.net/userfiles/file/zobexivegoridasa.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/kavuvetofegirojizino.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/xixozaku.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/gojolej.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/15542165272.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/tirudekugitofowi.pdfIn PDF document text
    • http://precisao.org/files/files/zisuzowivifuguk.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_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 17676 bytes
SHA-256: faf5e9ff88ffa9f465353c9b2f2237d555c5b40eaba74657ff48d4b23ce17819
font_01_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 11052 bytes
SHA-256: 3f6ad9eaedcc11d6c8fca174155804ced57e6578012aa6c1538ad673bb9d3c5f

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