PDF malware analysis — malicious · 541d9e1b89d44967

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 02:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: f0a81e707e2b1ba0ff320c0d5b45ba3c SHA-1: 65ba7d16f0ad56c23c20632b7b6eb9db10fab6cf SHA-256: 541d9e1b89d449671776e41582b9623a4296712fd694abf23d8f95e5fb24c65e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the phishing lure, aiming to trick users into downloading a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://catamma.ru/uplcv?utm_term=pes+17+iso PDF link annotation
- http://hotel-ambassador-nice.com/upload/files/nerutezuvenizuvoku.pdfIn PDF document text
- http://landroverbh.com/ckfinder/userfiles/files/wikugabebamakaziludam.pdfIn PDF document text
- https://keongracun.org/contents/files/25737889973.pdfIn PDF document text
- http://bephoangdung.vn/uploads/ckfinder/files/famutobalut.pdfIn PDF document text
- https://mysilo.com/upload/ckfinder/files/56297400346.pdfIn PDF document text
- http://lobi.md/userfiles/file/42811822364.pdfIn PDF document text
- http://ks-system.co.uk/ckfinder/userfiles/files/vezubawisizenufininon.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d82a118792b443b67210db318c21b4d4/wubidusepesilepexexab.pdfIn PDF document text
- https://gedayapi.com/userfiles/file/79980385039.pdfIn PDF document text
- https://sdhouse.info/ckfinder/userfiles/files/66260024274.pdfIn PDF document text
- https://rajatotogroup4.com/contents/files/xadif.pdfIn PDF document text
- http://kossuthdigisuli.hu/userfiles/file/gimibutoles.pdfIn PDF document text
- http://hqshop24.com/userfiles/file/93464868147.pdfIn PDF document text
- http://dokturmice.com/ckfinder/userfiles/files/8950334793.pdfIn PDF document text
- http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/lamegizenipezobajijafu.pdfIn PDF document text
- https://egca.fr/userfiles/file/livofiwigexomolupumeg.pdfIn PDF document text
- http://pileshoppen.dk/userfiles/file/nibevijuben.pdfIn PDF document text
- https://investkwik.com/userfiles/file/gobetefovaxusasatekoril.pdfIn PDF document text
- http://www.masozilina.sk/ckfinder/userfiles/files/81963044446.pdfIn PDF document text
- https://baohohoanglong.com/userfiles/file/5679471122.pdfIn PDF document text
- http://sanxuatbanthinghiem.org/app/webroot/uploads/files/lemixejitulo.pdfIn PDF document text
- http://www.veslovani-vsb.cz/soubory/file/jumaxosafudafekatosomefe.pdfIn PDF document text
- http://albertf.madteam.net/ckfinder/userfiles/files/57167580189.pdfIn PDF document text
- http://coachhouse.info/assets/file/89549926970.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_off0000dd2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD2C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f53e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF53E	18272 bytes
SHA-256: `e1ad3aea49393e1b86e77b2a664d4865fb65667b38bb17e41783a7b3ef9ec0e5`
`font_02_sfnt_off0001242e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1242E	9692 bytes
SHA-256: `fc94b4730592482e9d34368b7941e6e2485f076fdd404840b7aab960445ea678`

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