PDF malware analysis — malicious · cff0cd46ef0d4a41

MALICIOUS

PDF

75.4 KB Created: 2021-02-28 05:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1136dedd4ab373df8900449c5bc92d2e SHA-1: ab9e90db048b8b6d94c07e24b415bfafb1bc18de SHA-256: cff0cd46ef0d4a41de7e9de446d4c8bc9b9513aad764a74159b783764f6fd14e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to domains associated with link farms or SEO spam. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs strongly suggest a malicious intent to redirect users to potentially harmful sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://pelibifir.ru/strik?utm_term=learn+english+grammar+in+marathi+language+pdf
- http://joxetinosutuj.iblogger.org/56274351706.pdf
- https://static.s123-cdn-static.com/uploads/4370541/normal_6001076905eb3.pdf
- https://cdn.sqhk.co/senosekagoko/9iahjwC/jedaxewexe.pdf
- https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/rusotapesu.pdf
- http://budonap.iblogger.org/lemikome.pdf
- http://fujudigisegejeb.iblogger.org/health_economics_masters_programs_usa.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://vogojitipam.epizy.com/how_to_write_a_warning_email_to_an_employee.pdf
- https://s3.amazonaws.com/xonobijikivo/fixuwatavaforibobe.pdf
- http://jonemif.epizy.com/columbia_river_shad_fishing_report.pdf
- http://norilonabu.epizy.com/99678881987.pdf
- http://pogebikaku.epizy.com/vasetozabuw.pdf
- https://s3.amazonaws.com/levovod/zakifekasa.pdf
- https://s3.amazonaws.com/nefomojuwet/22452193979.pdf
- https://s3.amazonaws.com/bepukuba/beautiful_love_quotes_in_telugu_images.pdf
- http://woxedizoxe.rf.gd/a_connecticut_yankee_in_king_arthurs_court_movie_1995.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e927.bin` `62dad9c26dc7da8c53d434885f9fa89d0221b6d137734d32eab71a9912134a13`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE927	5396 bytes
`font_01_sfnt_off0000fb59.bin` `2180da26d0e57ad53bb9b650143e9f7f63f324bb04a82355878f11220871a8be`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB59	10916 bytes

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