Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f59a87f68573cd…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 22:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f283d6f0064fa4431383db8406365195 SHA-1: efecc2f994d351c241d263d8b10d3dccccabd91b SHA-256: a9f59a87f68573cd3116e399f2f1919ccc9976726a270df6b4c376b87ad06c44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to PDF files on various domains, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://budgetparking.ca/admin/uploads/file/gatomevolopamu.pdf In PDF document text
    • https://stijsr.com/userfiles/file/11222161205.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/natajirap.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/44886380391.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/wovuvurofesoronazap.pdfIn PDF document text
    • https://stotex.rs/files/82000789821.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xunalofovumipozafisek.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613031d1775e2---fojavibojadajufatotuk.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/pakagusefato.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/49009942272.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/62808914232.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/17042465225.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/vesidetabogij.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/madexitijanatit.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/2363137261.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/pukiraxukozidopegolafobe.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/suzebi.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/15130938378.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/74450823851.pdfIn PDF document text
    • https://activepymes.com/pub/file/54649641980.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210901220810_oja75k.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/14228439738.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12741186196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+disable+pop+up+blocker+on+chrome+mobilePDF 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_off0000b83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83C 15132 bytes
SHA-256: eb6bc9de6fe91dc532ef070d0504126f1949dde1c8f3bbde44a0b02a0edd886a
font_01_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 11188 bytes
SHA-256: af13fd7e30fe6e8d9cc1487b497b595a3d9e15b7d0df0ee79e380c5b8d8e09cc
font_02_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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