PDF malware analysis — malicious · b705f5f81f75da9d

MALICIOUS

PDF

64.0 KB Created: 2021-09-24 15:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 20d205928fac5749f8d7eb0ced62a27a SHA-1: 91a49aeb270ab5cc55b65c6e782aecb7acd8bd3e SHA-256: b705f5f81f75da9d84e78a7626459302f5060076e9dcc5a3c04de2f2a1118a92

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's part of a phishing or malware distribution campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.6829

Heuristics 4

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
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://cncforginghammer.com/d/files/lufurun.pdf In PDF document text
- https://studiovizia.com/webroot/img/content/files/87441950268.pdfIn PDF document text
- http://bernardthevenet.fr/ckfinder/userfiles/files/80949847005.pdfIn PDF document text
- http://birkhoffhi.com/userfiles/files/sozajerorul.pdfIn PDF document text
- https://kurtoglumob.com/upload/file/58505476411.pdfIn PDF document text
- https://pt2-turbo-j3t.com/contents/files/12859962254.pdfIn PDF document text
- https://webshopplus.nl/app/webroot/files/userfiles/files/mikefo.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5f6d60c4---pedeso.pdfIn PDF document text
- https://cowichanmusicfestival.com/userfiles/file/gomaxevudilunelexanipama.pdfIn PDF document text
- http://geoass.eu/userfiles/files/pufupinoto.pdfIn PDF document text
- http://entryexpress.online/chapter_images/files/keredubilekuwori.pdfIn PDF document text
- http://biznesfishki.ru/files/userfiles/files/jodososa.pdfIn PDF document text
- https://tdemo.order-pro.com/ckfinder/userfiles/files/giwawodoselora.pdfIn PDF document text
- http://lidaoxc.com/upload/files/jurenikozijifezebufevapud.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe49bd195---murodik.pdfIn PDF document text
- http://bsa-billiard.by/images_from_html_editor/file/vozotebeten.pdfIn PDF document text
- http://mvsexpo.ru/admin/ckfinder/userfiles/files/20326579065.pdfIn PDF document text
- http://novena99.com/uploads/files/202109181735313702.pdfIn PDF document text
- http://www.tiande-global.com/ckfinder/userfiles/files/6550355244.pdfIn PDF document text
- http://marcus-1.com/FileData/ckfinder/files/20210906_66A1CE23EB6FBEF5.pdfIn PDF document text
- http://ideal-site.ru/userfiles/file/zajufot.pdfIn PDF document text
- http://thesciencenetwork.org/uploads/files/35490132110.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+ultimate+robot+fighting+mod+apkPDF link annotation
- 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_off0000adb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xADB6	14856 bytes
SHA-256: `a33263248df38efe2ab1b7b2c5e6d66b80abe574187e9be3316bb3c68b08f7ac`
`font_01_sfnt_off0000d33b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD33B	11196 bytes
SHA-256: `ec9ed04a3708df38e4c7b3aef5204d88fe7dcf64160e93f5f67097c53e665037`
`font_02_sfnt_off0000ecd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECD4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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