Malicious PDF — malware analysis report

Static analysis result for SHA-256 184e88dee4234d73…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 13:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ee5e735fd245380bca9ba29b6c229010 SHA-1: 988d54b1c1a7a7b68d85b569f91679554fbd058f SHA-256: 184e88dee4234d737792f2ce6866432a4d8624cc84710d8dbea55f5a2fcac133
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to manipulate search engine results or host further malicious content. The presence of multiple PDF files hosted on different domains suggests a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://efnnma.org/files/file/14442396319.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ktbdlgvk9fl3i5b5otqbqibk86/zejuwajazelemewuge.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/54891991973.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/lalum.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/6560707216.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd2271a2f---56279430131.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/18840663417.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/41320119227.pdfIn PDF document text
    • http://chinalabware.ru/d/files/68912502247.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/37616993450.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/66741622760.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/jazul.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jumudenumaze.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/80794473354.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161303afb436f0---14789951890.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/38844736257.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/jilemevodezisevu.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210903030204.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/vewupolezekexobabomajelor.pdfIn PDF document text
    • http://partnercable.com/files/gamuje.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/11451875703.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109092116324698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=google+store+androidPDF 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 17688 bytes
SHA-256: e9b09bfc0c6dcc118e9ef56d2eb849f85c1761f9480f5f3f1c1a3573e5a4c605
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 10464 bytes
SHA-256: 43153e4bd5d12e7bbdbdc03d0766f4d3381663df15f46243cfc4c7818e20e645
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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