Malicious PDF — malware analysis report

Static analysis result for SHA-256 e656400f80ec68fe…

MALICIOUS

PDF

68.7 KB Created: 2021-09-18 02:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47a3c30b67f2c1cca0e9a44978d62579 SHA-1: f9aa63270d764415ee410c5d8b45d89179ec1a30 SHA-256: e656400f80ec68fe4a303d935346758571fc4bf0d20f934a4924c75703f88fae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, with one specific URL pointing to a redirector. The presence of numerous embedded URLs suggests an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=how+to+download+email+attachments+on+android PDF link annotation
    • http://royalgroup.at/tmp/24714090250.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/renijobigarakafekaxisor.pdfIn PDF document text
    • http://aurora-c.jp/files/files/63778985845.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/fidob.pdfIn PDF document text
    • https://successalpha.team/upload/files/gajisavon.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/xujenubuvogaxavijutaxa.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/52146310266.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/56120398254.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/nekojugokologevuxile.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109051325134750.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/90241226229.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/58350096662.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/ruwisitikejamosediwajok.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63ddc1d5e---70193712087.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/zifujopore.pdfIn PDF document text
    • http://hotstamping.pl/files/file/wobudavulop.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/mivowixonivelaxidi.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/71924554586.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/84625521200.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016d933e0f---98925670929.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/91582591673.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/93220537151.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_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 10712 bytes
SHA-256: 8c83e02230e164741fff225a8851b0a00ad965e11dc4677001a9918d2092e012
font_01_sfnt_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 14316 bytes
SHA-256: ebf200957c72904538533ca6fdc150d1e87b2d9bd4dce91073e8c02518b8143d
font_02_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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