PDF malware analysis — malicious · d7f770ef872421b1

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 06:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: aeed398a2dd183c11f4b9abf9213299a SHA-1: 0bfd777c37b0904d519321ff9a419ea81af83ce2 SHA-256: d7f770ef872421b187bf1a0e85bfe83b4390603bc6f7bb56b5506e98e3df9e7f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=strike+heroes+2+hacked PDF link annotation
- https://futurefacesnyc.com/uploads/file/jekoxojitofogaji.pdfIn PDF document text
- http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/54150452264.pdfIn PDF document text
- https://medsplus.us/admin/images/file/novutaparotep.pdfIn PDF document text
- http://manpukulivermore.com/uploads/files/82875150715.pdfIn PDF document text
- http://wawa757.com/uploads/files/21926040159.pdfIn PDF document text
- http://terredellamagnagrecia.com/userfiles/files/notab.pdfIn PDF document text
- http://nbmounts.com/userfiles/file/1630554805.pdfIn PDF document text
- http://rc-modeller.se/images/file///61462690272.pdfIn PDF document text
- http://aranysolyomfeszke.hu/editor_up/kilovon.pdfIn PDF document text
- https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84949783541.pdfIn PDF document text
- https://propage.q-cloud.net/upload/ckeditor/pages/files/45739601023.pdfIn PDF document text
- http://talesma.com/E/file/rapowasuretigixi.pdfIn PDF document text
- https://glearningsolutions.com/userfiles/files/77398773333.pdfIn PDF document text
- http://sangjeom.com/userfiles/file///60284848718.pdfIn PDF document text
- https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/72678512628.pdfIn PDF document text
- http://bjhtdszdh.com/v15/Upload/file/202196730511224.pdfIn PDF document text
- http://www.stadion-zarya.ru/ckfinder/userfiles/files/tulofudepereravaresebebib.pdfIn PDF document text
- http://jrecchina.com/ckeditor/ckfinder/userfiles/files/jadakinosabedelorabolulo.pdfIn PDF document text
- https://nieruchomosciturystyczne.eu/files/file/63771081469.pdfIn PDF document text
- http://shqinze.net/admin/upimg/file///xadufesezavopiwikixefam.pdfIn PDF document text
- https://villanakarin.com/userfiles/files/romozijajul.pdfIn PDF document text
- http://5mal4.de/moneyvidya/web/images/userfiles/file/25335116529.pdfIn PDF document text
- http://bestapp4u.com/admin/uploadedfiles/file/31401667411.pdfIn PDF document text
- https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/xupevepawaziv.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_off0000cbe1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e3f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3F3	18028 bytes
SHA-256: `c07ffc8a280e1b0346fbd93428e15013a3c589c4ad28a5285b19bf0e42f9d6d6`
`font_02_sfnt_off00011336.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11336	10604 bytes
SHA-256: `5b83dfd47a7d248c4f2833d7e891d38c67c48485615a9c6aceb7e58082ce8138`

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