PDF malware analysis — malicious · 42dc937eceb29067

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 06:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: be7a1ccdac211364298c58aa12139a66 SHA-1: 5f803b00fa527547b5adc96a7589053d94f7d69d SHA-256: 42dc937eceb29067480cbc518024ec107ae7802a4535e999ff5cc1ef53f61520

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external PDF files, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a tactic to distribute or host malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://signos.larrialdiak.es/files/galeria/files/45117825759.pdf In PDF document text
- http://abwvictory.com/uploads/files/90664533358.pdfIn PDF document text
- https://people11people.com/uploads/File/pewitakabof.pdfIn PDF document text
- http://unitekinfostructures.com/userfiles/file/40311615507.pdfIn PDF document text
- https://dorfadvertising.com/ckfinder/userfiles/files/mupanu.pdfIn PDF document text
- http://topup-fight.com/ckfinder/userfiles/files/gusazefabuvibovukubarunod.pdfIn PDF document text
- http://cachnhietcacham.vn/Images_upload/files/wepimapatoso.pdfIn PDF document text
- http://gonganmi.com/userfiles/file/sitigolafiwunimise.pdfIn PDF document text
- https://objednavky.dortovapohotovost.cz/obrazky/files/wafelepajozabipota.pdfIn PDF document text
- https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/dolatijadumidepazoko.pdfIn PDF document text
- https://wigs4less.net/nbloom/fckuploads/file/50728232397.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613938238003c---25713121266.pdfIn PDF document text
- https://nffcd.org/userfiles/files/xopoleperepakatomopozusa.pdfIn PDF document text
- https://contact-house.com/fckeditor/upload/file/71773146267.pdfIn PDF document text
- https://granitabrasive.com/editor_up/parekutodebiwotajukonis.pdfIn PDF document text
- http://aptwash.com/userData/ebizro_board/file/regupivilibifutawer.pdfIn PDF document text
- http://kammerchor-lindau.com/file/lilulopig.pdfIn PDF document text
- https://www.multilandtours.com/assets/ckfinder/userfiles/files/famigesexa.pdfIn PDF document text
- http://closehorses.com/userfiles/file/vazerukatanowi.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613068b21c826---korupopipimumotogenudum.pdfIn PDF document text
- http://dailymaydemtien.com/userfiles/files/nodutodatomu.pdfIn PDF document text
- http://waycreon.net/bhaskar/yii/upload/files/8006167770.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=so+s20+launcher+pro+mod+apkPDF 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_off0000adf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xADF5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c607.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC607	16088 bytes
SHA-256: `71c715326fa4b31afc56653b13244812d47eb21d85cc44e927a3fda6ccf4e4ed`
`font_02_sfnt_off0000eea8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEA8	11096 bytes
SHA-256: `8383f54940e6c8534107760e8f85ff3d200b8532bfdc0ac5e3953fd6d9d68c8f`

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