PDF malware analysis — malicious · c6710604d0d866c7

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 20:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: cba77fa9f384b30fe15d6ad672b1eae8 SHA-1: 921cb3fa6f42965a0407f7c4bd9d35437475cb08 SHA-256: c6710604d0d866c7e179ed02f66bc1fc375932b16e2e91de7487d7c2d6fde0bb

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains a large number of external URIs, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://jrpst.pl/userfiles/file/mikijawasoxinonekifami.pdf In PDF document text
- http://mcserpenti.com/userfiles/file/40210452517.pdfIn PDF document text
- http://a-swiss.com/upload/userfiles/file/literunagezu.pdfIn PDF document text
- https://ginecologmuresan.ro/ckfinder/userfiles/files/moxilipixab.pdfIn PDF document text
- https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f8ac6af13f2926793cc352b331137c03/27606811810.pdfIn PDF document text
- https://distriparkbotlek.nl/userfiles/files/vupizog.pdfIn PDF document text
- http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/vukaluradifuzo.pdfIn PDF document text
- http://centreforeffectivecoaching.com/media/file/bumefi.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/328dec7e84d044ed82f95550b61534b0/27481272490.pdfIn PDF document text
- http://ecoaga.com/documentos/file/pepibiwonid.pdfIn PDF document text
- http://angelofthewinds.net/ckfinder/userfiles/files/vidujutisimuwu.pdfIn PDF document text
- http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/34130662687.pdfIn PDF document text
- http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nazijumipi.pdfIn PDF document text
- https://pointswestliving.com/ckfinder/userfiles/files/74329143955.pdfIn PDF document text
- https://economiadecomunion.com/ckfinder/userfiles/files/14618374757.pdfIn PDF document text
- https://biodent.ro/m4fm_files/m4news/ck-uploads-files/63397016218.pdfIn PDF document text
- http://stardentalcare.org/userfiles/file/gutumuwuvizuwumutemixize.pdfIn PDF document text
- http://marchmontnews.com/imgs/file/436658283.pdfIn PDF document text
- http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/52928274006.pdfIn PDF document text
- http://saveursetsavoirs.fr/image/file/33757937833.pdfIn PDF document text
- http://trust-law-firm.com/userfiles/file/20210911021147_1008050093.pdfIn PDF document text
- https://beamstraffic.com/amb/userfiles/file/siralatokenefa.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=gta+san+cleo+modPDF 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_off0000d81e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD81E	18076 bytes
SHA-256: `67559a93125390cc7926c8e34bd9513da966c8591954333dbb6e33936a74164b`
`font_01_sfnt_off0001078c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1078C	10376 bytes
SHA-256: `67a5d902cc92fc6332d2fc1019c2146cfd89144d71ded00f582a31319de97293`
`font_02_sfnt_off00011f13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F13	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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