Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e07c47722ca3c6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 16:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64f7db9e6df637b29a2ae4bee9b570be SHA-1: 422724caa12afd73d9381b80869da6067cb4ba8c SHA-256: a1e07c47722ca3c604be520f4c3567f1a0fff0954d9dd2507005e29e25df5934
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to redirect users to numerous external hosts, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gorisum.net/fckeditor/upload_file/file/vememetitav.pdf In PDF document text
    • https://orcasproje.com/userfiles/file/jewikegixejunapoxapabufi.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/15296450487.pdfIn PDF document text
    • https://upaspor.com/resimler/files/96139749433.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/42246047262.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/fewalepikexesufujokiti.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/67986895180.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/82199782724.pdfIn PDF document text
    • http://offerparts.com/upload/files/57543560439.pdfIn PDF document text
    • https://eklyps.net/images/file/ziwogajol.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/bosefeze.pdfIn PDF document text
    • http://topflexsports.com/uploads/56627702775.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/verizatovovi.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/verokatidopesu.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/zapalasovesoxapibotizesun.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/derilazukikapowaru.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/95891727031.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/98983467654.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/rebegonutadu.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/176987356.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/xosesidaxudikupig.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gawoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+my+style+menPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/67750783910.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_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 10260 bytes
SHA-256: b9b16bd339e06ffe2da02d94f67595f9222c288ea43859a12107f5a9d89797a5
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 17964 bytes
SHA-256: 5e5465a5b00b8ddbbd63c305158b0f4a75eadabe53d4f722bf43a24ced840290
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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