PDF malware analysis — malicious · d9479d2be267f658

MALICIOUS

PDF

88.7 KB Created: 2021-09-13 23:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 556191163474a95e7e950c62bdf19f38 SHA-1: 73402f43e242fe7f62afd00fa6948ee24d525bea SHA-256: d9479d2be267f658f59a76cff0b92109a9e09a04e3dcd2462a4fe6e745a96ca0

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the link farm heuristic point towards an attack pattern focused on redirecting users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=playing+gif+in+android PDF link annotation
- http://phuocthuan.vn/images/pic/file/degaseluderodatajuj.pdfIn PDF document text
- http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/94604381739.pdfIn PDF document text
- https://economiadecomunion.net/ckfinder/userfiles/files/79666670734.pdfIn PDF document text
- https://europawindow.com/app/webroot/img/main_content/files/55033252988.pdfIn PDF document text
- http://sartoriaventurini.com/userfiles/files/suvunutufa.pdfIn PDF document text
- https://trainova.com/userfiles/file/57440706813.pdfIn PDF document text
- https://cplastik.eu/data/cms/file/ruwupogon.pdfIn PDF document text
- http://computer-rudolstadt.de/upload/file/wajidagajoluda.pdfIn PDF document text
- http://samocvet.org/foto/ck/files/buzuxezodonakexugimu.pdfIn PDF document text
- https://onutglen.com/caningest/images/file/69841011014.pdfIn PDF document text
- http://kfnmdg.com/upfolder/e/files/20210903123610.pdfIn PDF document text
- http://tarnava.eu/user_images/file/75078249522.pdfIn PDF document text
- http://krukewittfarms.com/userfiles/file/29753010886.pdfIn PDF document text
- http://associatedreclaimed.reclaimedoils.com/userfiles/files/bigodibogededitu.pdfIn PDF document text
- https://ismart99.net/upload/files/68259999459.pdfIn PDF document text
- https://rentcar888.com/uploads/files/202108312036072823.pdfIn PDF document text
- https://wita.lt/images/files/14463464874.pdfIn PDF document text
- https://paymentor.nl/uploads/file/genex.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/52522211504.pdfIn PDF document text
- http://xn--o79av69abka850ab6c.com/upload/file/202109051153430483.pdfIn PDF document text
- http://studioarchoggianiepartners.it/userfiles/files/26249421600.pdfIn PDF document text
- http://xn--9w3b270a7kf.kr/data/editor/file/26061654199.pdfIn PDF document text
- https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/2892404698.pdfIn PDF document text
- https://aqua2go.pl/galeria/file/19432373794.pdfIn PDF document text
- https://goodluckfishing.com/ckfinder/userfiles/files/tiwaniwejitiziwolanigemo.pdfIn PDF document text
- http://imcborivali.org/userfiles/file/66651613731.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_off0000f7ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7AB	18168 bytes
SHA-256: `fbe51d26fd6574c9d42eebcb9cb66e1f56aaeaf7ba289fe0c33e72cc240e7067`
`font_01_sfnt_off000126b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126B5	10244 bytes
SHA-256: `574d08905b53f74c103ae4bbc4dbc23db0d51ba097e39342f5977d75252c538d`
`font_02_sfnt_off00013d8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D8C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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