PDF malware analysis — malicious · 24cc58d9e373064e

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 05:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 2e7785b3e034589d58c5b58e385a23fc SHA-1: db89ebd2fc9012964368af29e58607a548521f66 SHA-256: 24cc58d9e373064eb5f502c84921d270e969d29cb9f7aa03f1b90fa7fdde2490

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and ML classifiers, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to potentially malicious content, suggesting an attempt to redirect users to phishing sites or download further malware. The heuristic PDF_RANDOM_URL_LINK specifically highlights the generation of algorithmically-created URLs, reinforcing the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

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
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://pistant.ru/uplcv?utm_term=djvu+reader+apk PDF link annotation
- http://zensushialiso.com/uploads/files/69224041718.pdfIn PDF document text
- http://techcessgroups.com/userfiles/file/kigegezimagefubofukaxef.pdfIn PDF document text
- https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/27891561655.pdfIn PDF document text
- http://creative-format.com/upload/editor/files/potilenafuzafozane.pdfIn PDF document text
- https://suksesunited.com/contents/files/raruzabipelufamifufadop.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135928f3b9ec---toguvunulusefon.pdfIn PDF document text
- http://vinhthuan.vn/upload/files/nunikija.pdfIn PDF document text
- http://clinicaveterinariacittadivignola.com/userfiles/files/23234717811.pdfIn PDF document text
- https://transmilenio.net/datamont/userfiles/file/jasiziroje.pdfIn PDF document text
- http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wuxegulovofebevefezibipa.pdfIn PDF document text
- https://sledovani2.gpshlidac.cz/www/userfiles/files/kuzadiremowujafogexufog.pdfIn PDF document text
- http://www.jucadent.es/ckfinder/userfiles/files/rimamabajobapori.pdfIn PDF document text
- http://mrcubezpieczenia.pl/app/webroot/media/files/revevoviviwamogufon.pdfIn PDF document text
- https://ietc-oman.com/userfiles/files/44226851326.pdfIn PDF document text
- https://probidjp.com/ckfinder/userfiles/files/20210906_200814.pdfIn PDF document text
- http://wwstationery.com/files/file/53520043672.pdfIn PDF document text
- http://interroadholland.nl/userfiles/file/12773002589.pdfIn PDF document text
- http://clinical-pain.com/pds/userfiles/files/jimanepefivawijulolo.pdfIn PDF document text
- http://izeninfo.net/admin/upload/files/titogulizukulituzomo.pdfIn PDF document text
- http://macabrey-luthier.fr/data/Files/59126296240.pdfIn PDF document text
- http://lsphc.com/userfiles/file///dimiperafukepevi.pdfIn PDF document text
- http://moestuinwebshop.nl/userfiles/file/15924736522.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_off0000c23f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC23F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000da56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA56	10148 bytes
SHA-256: `8b3ac3063cc8df3cb0f6ace728dac0b214877f7e81889cbf3c3d7d71c23e2732`
`font_02_sfnt_off0000f123.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF123	18560 bytes
SHA-256: `c2834f73ff8c287e875ed5b0af4f69c52db3feb286c3934030a9138cccbf8579`

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