PDF malware analysis — malicious · 96407f48101e0ad2

MALICIOUS

PDF

67.4 KB Created: 2021-09-21 08:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 33ba0253eb58e5ce74b12e6a9b3c533a SHA-1: 9f17b17cc8b2237848e398cb5691696ded189db3 SHA-256: 96407f48101e0ad2d1614b48b2c4abb50ed8d77370a6b9edbb7666df27bfb1bd

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, low-reputation domains for hosting links, further supporting a malicious intent to distribute or phish. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=pdf+sam+basic PDF link annotation
- https://www.ftha.org/admin/ckfinder/userfiles/files/7040962126.pdfIn PDF document text
- https://china-glass-mosaic.com/userfiles/files/20210916_061601.pdfIn PDF document text
- http://odpadykj.cz/UserFiles/File/61215760356.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5d61859fa4e71bd39e6704433be6a597/1982783937.pdfIn PDF document text
- http://nage-z.com/ckfinder/userfiles/files/turenafam.pdfIn PDF document text
- http://4els.ru/uploads/images/files/59588558788.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/32247d23dec6ccffc76a85e665b77ac1/tebabalopibawu.pdfIn PDF document text
- https://www.idd.no/ckfinder/userfiles/files/12846886902.pdfIn PDF document text
- http://skkouty.cz/ckfinder/userfiles/files/jarudigurekuj.pdfIn PDF document text
- http://www.gyndoktors.de/ckfinder/userfiles/files/xotozoxix.pdfIn PDF document text
- https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/36567814783.pdfIn PDF document text
- https://bimore.vn/webroot/img/files/walanegilakovozo.pdfIn PDF document text
- http://xn--m1age8bh.xn--p1ai/files/file/2108308400.pdfIn PDF document text
- https://homeuu.biz/upload/ckeditor/pages/files/86361091296.pdfIn PDF document text
- http://ohsongpharm.com/ckfinder/userfiles/files/pababimulepe.pdfIn PDF document text
- https://clifestyle.net/uploades/userfiles/file/bavifud.pdfIn PDF document text
- http://refpecsbelvaros.hu/kepek/files/xavojogujijegeparirer.pdfIn PDF document text
- http://soc-in.com/data/media/files/mitonagexivepek.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_off0000aa43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAA43	15308 bytes
SHA-256: `b94df655807d141c4188dd8d115baff9e240c44cbddfa836854ed3922a88f97d`
`font_01_sfnt_off0000d0a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0A0	10176 bytes
SHA-256: `fc19683464c13e421f890e517ee24f58bada88f79c9dc5b39f9ad7862d1ac1b8`
`font_02_sfnt_off0000e76f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE76F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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