Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0c15f1056a5edc…

MALICIOUS

PDF

105.3 KB Created: 2021-09-15 22:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99f74db69a5a6348edcd8668b73b050a SHA-1: 6abefee1d77f9d2637e4ceda20ad1680e7b4e248 SHA-256: 2b0c15f1056a5edcb4aad330eb02abe1373cbdffd87be2d05e64e5b1871e2519
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, identified by the PDF_JAVASCRIPT heuristic, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to potentially disposable domains, further suggests a phishing or malware distribution scheme. The primary attack pattern involves leveraging JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://mothertheresapublicschool.com/userfiles/file/15601571230.pdf
    • https://yellowmangocafe.com/userfiles/file/56147036071.pdf
    • http://hondatayho.vn/images/ckeditor/files/59065446587.pdf
    • http://elsped.hu/files/file/segimutepejomefufili.pdf
    • http://lenosada.sk/editor_uploads/files/99508528123.pdf
    • https://atlastoursntravels.com/userfiles/file/4908568677.pdf
    • http://sevvalturizm.com/rsm/files/xivasokiwe.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/4091192500.pdf
    • https://alcoquimicos.com/ckfinder/userfiles/files/80169367489.pdf
    • http://namjapizza.com/app/webroot/files/97515271213.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f2e43036---peripoku.pdf
    • http://poexali.org/static/image/_u/system/files/razasazelidovudu.pdf
    • http://factorycontrolprojects.com/userfiles/file/wotizukugitubiletiwugifo.pdf
    • http://nc-israel.ru/upload/files/nonasurezo.pdf
    • http://hieuchuan.com/upload/files/73317581288.pdf
    • https://cmf8.ir/data/file/toponuvadufifek.pdf
    • http://knowleangling.co.uk/ckfinder/userfiles/files/vixenifabopax.pdf
    • https://alutat.com/data/file/59310512521.pdf
    • http://ristorantebiscione.com/userfiles/files/6117217848.pdf
    • http://songhakbbq.com/uploads/files/tiginumidepixurabix.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/78586274875.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27737030571.pdf
    • https://businesslife.com/content/files/30363480844.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nexus+6p+angler
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013184.bin
ec0726afd4671962769e7d7a251b14f663162bcb22b14caccb01e1ba80f8c30c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 10464 bytes
font_01_sfnt_off00014977.bin
5592d6906f0cbcb2c4fffd60d21b8de3b9016b8922bc8df99f150cb1af28cdc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14977 20352 bytes
font_02_sfnt_off00017fb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB7 16792 bytes

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