PDF malware analysis — malicious · 4873f3f82a4f501c

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 22:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 64a7c284bcd53e8c2735af1997d383e1 SHA-1: ab9449a709282a41bcce153524f4704e8f06beb1 SHA-256: 4873f3f82a4f501c2af4c6e3d5320278b78b4248c892538351702e5148e1efe0

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, 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 explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious websites, likely as part of a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=the+walking+dead+season+10+gomovies PDF link annotation
- https://gkia.org/kingkong/userfiles/files/63195139005.pdfIn PDF document text
- http://dxczx.com/ckfinder/userfiles/files/20210913_062755.pdfIn PDF document text
- http://thayloilocnuoctaihanoi.net/upload/files/finevopiperakipupowuwasi.pdfIn PDF document text
- http://lakesnwoodskerala.com/uploads/file/ridukufawidadisagadapigi.pdfIn PDF document text
- http://sonhanint.com/uploadpic/sun/files/202109131006247421.pdfIn PDF document text
- http://nemeckystrakac.sk/editor_uploads/files/wolokerabomodomupuf.pdfIn PDF document text
- http://gaestehaus-am-erlkoenig.de/img/editor/file/nulukoxujunowumewolufuw.pdfIn PDF document text
- https://buyafranchise.org/files/files/86387911093.pdfIn PDF document text
- https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e459b8fd---61201653518.pdfIn PDF document text
- http://kunbot.com/upload/files/kajopomevaj.pdfIn PDF document text
- https://letajicikoberce.cz/userfiles/file/23211825544.pdfIn PDF document text
- https://cfaegaianascente.pt/portal/userfiles/files/xisibosijebokeko.pdfIn PDF document text
- http://showplus.ae/userfiles/files/66752528164.pdfIn PDF document text
- https://villadorottya.hu/uploads/frontend/files/tijixesatakulilefu.pdfIn PDF document text
- http://grubstreet.ca/ckfinder/userfiles/files/bipuripalebegozobadekop.pdfIn PDF document text
- http://lotusromeo.fr/app/webroot/files/userfiles/files/xutesumoxekozavik.pdfIn PDF document text
- https://congthuonghotel.vn/app/webroot/files/images/pages/files/fonigafesorib.pdfIn PDF document text
- https://tekmaker.com/upload/files/69730738607.pdfIn PDF document text
- https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/nofelaxixutasasuguzawo.pdfIn PDF document text
- http://candientu24h.vn/webroot/img/files/nurulofumirud.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/68ffb8108b76c683d5940344d4b33f58/muxonuwanifefinezanipuj.pdfIn PDF document text
- https://www.gpaci.org.br/cms/ckfinder/userfiles/files/41974472741.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_off0000d714.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD714	18264 bytes
SHA-256: `f17862468e03a5d0b66cb77a839e2b67fd921d93dbc2fdb94891999b6674afc4`
`font_01_sfnt_off000106ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106AB	10876 bytes
SHA-256: `af3769e4de50afc1eae66af4046a94195d036529733c8ac66822df0701f76cb6`
`font_02_sfnt_off00011f78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F78	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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