PDF malware analysis — malicious · fab633c381b7f332

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 05:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7b886cf23d1b29fd46ecf7c74c4156a9 SHA-1: 84342dc05963f2d0d0de2d048c8d281deca07b53 SHA-256: fab633c381b7f3328690ad3269d608efcb08def1d5c274a1ca2f50607bf04d41

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing duplicate object bodies and external URI references, further supporting its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://coretry.ru/uplcv?utm_term=pillow+thoughts+3+pdf+free+download PDF link annotation
- http://romanakladatelstvi.cz/userfiles/file/vevujisufojudazujiwowexow.pdfIn PDF document text
- http://www.anieliasfx.com/uploads/textareas/file/gejelod.pdfIn PDF document text
- http://gzky.cn/dubeite/ckfinder/userfiles/files/20210916_070355.pdfIn PDF document text
- http://abovomedia.hu/_user/file/1944513810.pdfIn PDF document text
- http://cdkuys.handysociality.com/upload/files/bawexamupob.pdfIn PDF document text
- http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/52630085849.pdfIn PDF document text
- http://orkoien.com/userfiles/files/bareveguwowef.pdfIn PDF document text
- http://scouttautomotive.com/editor_uploads/system/files/37276058135.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1614533cb6ee59---jokitudofinabelami.pdfIn PDF document text
- https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/pimoxarigudokozixoz.pdfIn PDF document text
- http://studiostocchi.eu/userfiles/files/24678609592.pdfIn PDF document text
- https://interstudy.net/userfiles/file/74934980622.pdfIn PDF document text
- https://fontaine-eva.fr/userfiles/files/sexejixiwunudido.pdfIn PDF document text
- https://www.pharmawell.eu/ckfinder/userfiles/files/tekopupodazixasofil.pdfIn PDF document text
- http://35ju.21tg.cn/uploadfile/ckeditor/files/sujizupadufabigi.pdfIn PDF document text
- http://bestapp4u.com/admin/uploadedfiles/file/25885608813.pdfIn PDF document text
- https://vilus.cz/userfiles/file/sumuwu.pdfIn PDF document text
- http://come2menorca.com/images/file/jimugatarelofijava.pdfIn PDF document text
- https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/82752163926.pdfIn PDF document text
- https://zilalcooling.com/other_files/File/jepegakuwuxul.pdfIn PDF document text
- https://nvsrolko.org/ckfinder/userfiles/files/wubuvamoxepomavi.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396bb6a3366---2462087180.pdfIn PDF document text
- http://sinostandards.net/upload/files/27325979774.pdfIn PDF document text
- https://juvelyrikoscentras.lt/Files/file/wosowulasumuk.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c946.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC946	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e15d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE15D	11136 bytes
SHA-256: `300184c372eabdbafc38a90d19d8697907704de253d41f84d7f5b013f2284fb3`
`font_02_sfnt_off0000fb33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB33	17792 bytes
SHA-256: `b0120f4d2283ac6e687e1b7fd646f9e97a05a1b3fc5b8097f62d6ab9f21d388c`

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