PDF malware analysis — malicious · 56099ae2ae7dfa34

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 16:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 6823970960518aa8ef6304e0612d206f SHA-1: 7fbf1470726089a304714dcb717eb72394446667 SHA-256: 56099ae2ae7dfa348609411ad8be4f5be45c70741c7d57a703e1920467868c3a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external URIs, including one pointing to a link farm with numerous disposable domains. The PDF likely exploits a vulnerability or uses social engineering to redirect the user to these external links, which may host further malicious content or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://f-okinawa.com/img/tmp/files/zubujidalazovafi.pdf In PDF document text
- https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bedisowanifarimuw.pdfIn PDF document text
- http://win-sonic.com/ck_imgs/files/60037142136.pdfIn PDF document text
- http://tg-focus.ru/userfiles/files/nenigedakim.pdfIn PDF document text
- http://3t-t.com/User_File/UpFile/file/20210904070006_d290aWd1c2Vwb2ZpZHV0.pdfIn PDF document text
- http://www.optimizecost.com/admin/ficheros_fckedit_subidos/lamakobo.pdfIn PDF document text
- http://aydinservis.com/ckfinder/userfiles/files/70879406613.pdfIn PDF document text
- http://longruiglass.com/ckfinder/userfiles/files/20210904_205244.pdfIn PDF document text
- https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/3914830341.pdfIn PDF document text
- http://chengzechem.com/upload/files/5126148786.pdfIn PDF document text
- https://coaching-jk-academic.com/ckfinder/userfiles/files/fazosa.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c17cede5b2---23976472374.pdfIn PDF document text
- https://smg.bid/ckfinder_userfiles/files/42296878382.pdfIn PDF document text
- https://kaparatt.com/images/File/78355950579.pdfIn PDF document text
- https://vipbeachhouse.com/uploads/editor/file/memaliriw.pdfIn PDF document text
- http://extrastyle.ee/ckfinder/userfiles/files/53626462351.pdfIn PDF document text
- http://isystemlab.com/admin/ckfinder/userfiles/files/18892341347.pdfIn PDF document text
- http://sdes.in/uploads/juluripunubivak.pdfIn PDF document text
- https://ylwlgwadmin.ylwl.cn/upload/files/73847941441.pdfIn PDF document text
- http://ineke-ott.nl/keramiek-beelden-imagesfile/supodesu.pdfIn PDF document text
- http://abwlargo.com/uploads/files/84483618052.pdfIn PDF document text
- http://zoncmswebsitebeheer.nl/files/editor/file/75755384909.pdfIn PDF document text
- http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/99855565796.pdfIn PDF document text
- https://reaga.net/js/ckfinder/userfiles/files/18444680564.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=number+one+game+in+play+storePDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cef8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEF8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e70a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE70A	17396 bytes
SHA-256: `4561cf67a6f82fa74dbff055e783d1be2b167aa1eab1621bec57508716419c1e`
`font_02_sfnt_off00011414.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11414	10928 bytes
SHA-256: `ee3a938d54c91e00cfa8bea512466c50dd4a4579f045cfe16d9bff1e1dade8d8`

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