PDF malware analysis — malicious · 4ce5235455b431f3

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 06:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0074ce306172578e5b3bf7ddfff8b9ca SHA-1: bbae2d4e75bda8f051b758f99d1d2a25491cfab2 SHA-256: 4ce5235455b431f3cdf8b3c6a01f6bccece34dd0f0bbbbf581b43a5c10d141f8

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a series of external URLs, forming a link farm, which is a common phishing or malware distribution tactic.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

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.
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://nfc-lampang.com/user_img/files/fadurakabev.pdf In PDF document text
- https://iskoruma.com/upload/ckfinder/files/folixin.pdfIn PDF document text
- http://dhalahoredeals.com/survey/userfiles/files/lumalapewegugazat.pdfIn PDF document text
- http://edv-denk.com/userfiles/file/55719943822.pdfIn PDF document text
- http://quimis.net/js/ckfinder/userfiles/files/38584823580.pdfIn PDF document text
- https://epponline.com/mentorfinancial/page_images/file/50902512578.pdfIn PDF document text
- http://obrienbuilders.com/userfiles/file/fafisegonavenazovajex.pdfIn PDF document text
- https://sardavetri.it/userfiles/file/jokuxonelevalasepuzegax.pdfIn PDF document text
- https://my-natural-style.net/upload/files/73301807714.pdfIn PDF document text
- http://czernavendeghaz.hu/admin1/file/vofebekidirubenemifu.pdfIn PDF document text
- https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/1gcqqsdl3ppb96usja6u1s03va/82627107020.pdfIn PDF document text
- https://alice-immo.com/userfiles/file/xevesodirekofudoxomo.pdfIn PDF document text
- http://ylphs.com/ckfinder/userfiles/files/kirenenodezukaviso.pdfIn PDF document text
- http://kxnjl.com/userfiles/files/dewufemugu.pdfIn PDF document text
- http://makesrealsense.com/ckfinder/userfiles/files/4157211465.pdfIn PDF document text
- https://paperland.bg/uploads/file/46197380386.pdfIn PDF document text
- https://vietnaminsight.biz/ckfinder/userfiles/files/kuwirefujatalir.pdfIn PDF document text
- http://hc6999.com/userfiles/files/zitifafo.pdfIn PDF document text
- https://fcimoveis.com/imgs/file/fepakekuwax.pdfIn PDF document text
- https://www.sterlingsez.com/ckfinder/userfiles/files/valexapukufafapin.pdfIn PDF document text
- https://valgott.com/images/userfiles/file/vafoxonazi.pdfIn PDF document text
- http://jlicentral.com/images/authors/file/93906014107.pdfIn PDF document text
- https://artofsurfing.com/preview/ckfinder/userfiles/files/15538259090.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=aosp+phone+apkPDF link annotation
- https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/39396157070.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_off0000b1e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1E1	16868 bytes
SHA-256: `b614646e978a8092b5f75bac12682d4a311400fc171515fd078a61983ec7bfe4`
`font_01_sfnt_off0000dbe1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBE1	10084 bytes
SHA-256: `ce56b7614acafa94e2d8a69d34e3fba780c92dfe247d62689e20db1aca1a7852`
`font_02_sfnt_off0000f256.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF256	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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