PDF malware analysis — malicious · 38695fab24bce27a

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 23:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 8b65fe25c78b8066ee01960a5c8a1023 SHA-1: f11734c1e26cee04c8c2195ac5aaa0c08ae63cec SHA-256: 38695fab24bce27aad7db9d2d5d28f49ac50634e275e7af72b1ac3c732068c24

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous distinct URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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 http://cybernet-ap.com/UserFiles/File/8125887405.pdf In PDF document text
- http://piri-piri.pl/ckfinder/userfiles/files/wopupedufaxe.pdfIn PDF document text
- http://gancza.pl/userfiles/file/96135775205.pdfIn PDF document text
- https://ensegun2.com/ckfinder/userfiles/files/bovatirobelenukalukapez.pdfIn PDF document text
- http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xibigepoworirofikopogafo.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/kavuwilukedixakijixe.pdfIn PDF document text
- http://deshdunya.com/blogimage/file/telujoseduf.pdfIn PDF document text
- http://khocabien.com/uploads/files/79557504794.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb9f8628d---83129691178.pdfIn PDF document text
- https://thuaphatlaihoanghuy.com/uploads/files/waroxofu.pdfIn PDF document text
- http://tribo.kz/userfiles/File/15820936856.pdfIn PDF document text
- http://studiopassarotti.it/userfiles/files/67157983323.pdfIn PDF document text
- http://asupuro.com/upload/save_image/files/fimapaw.pdfIn PDF document text
- http://energo-winstal.pl/userfiles/file/2013409257.pdfIn PDF document text
- http://chinasoftcore.com/userfiles/file///6778500372.pdfIn PDF document text
- http://soyaksiesta3.com/userfiles/file/zisakotufusewuwo.pdfIn PDF document text
- https://mailing.crpm.ch/ck/ckfinder/userfiles/files/11851496139.pdfIn PDF document text
- http://dalnoboy.org/data/filestorage/upload/files/jakamuzudegi.pdfIn PDF document text
- http://hoaisonland.vn/upload/files/zuworele.pdfIn PDF document text
- http://hongshengfish.com/uploadfiles/2021091408495085001.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=shadow+fight+play+storePDF 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_off0000addd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xADDD	14488 bytes
SHA-256: `6b538b9ff0027ffb17d1fee6100c26e618ab098433a26738d43b503d7e86751a`
`font_01_sfnt_off0000d293.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD293	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eaaa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAAA	10948 bytes
SHA-256: `425fb15a63bfe979acc94d56c978c4faced6be703bdcdd0467e1b7b8d03b7983`

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