PDF malware analysis — malicious · 784cd174a848dfe5

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 22:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 962f404d9e4259084e8192ebe6610693 SHA-1: 6dfbb81ff4e15db2ba551865e6e785f9fbf9ed2f SHA-256: 784cd174a848dfe55e6b760c18d5c61acc714c893b59ac0a401afbf915cd9507

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a dropper for further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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.
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://pistant.ru/uplcv?utm_term=internet+download+manager+for+windows PDF link annotation
- https://aristi-trap.com/upload/users/files/77591087443.pdfIn PDF document text
- http://backupcenters.com/userfiles/file/40596193740.pdfIn PDF document text
- http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/80565528790.pdfIn PDF document text
- http://partnercable.com/files/4848305720.pdfIn PDF document text
- http://antonioruizabogados.es/userfiles/file/80000997580.pdfIn PDF document text
- http://tks-forever.com/upload/2021/09/18/file/vupisevifaribux.pdfIn PDF document text
- http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixipusixuwukatifevagemoz.pdfIn PDF document text
- http://melly-incendie.fr/img_db/20995420589.pdfIn PDF document text
- https://drlalashow.com/php/billboard/uploads/file/foromu.pdfIn PDF document text
- http://xn--aknmedcal-wpbe.com/uploads/file/kanavisabenezonajelonufow.pdfIn PDF document text
- http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/pekogonukofipipekeze.pdfIn PDF document text
- https://samsungklimalar.com/upload/ckfinder/files/22973771165.pdfIn PDF document text
- http://tuclubcr.com/campannas/file/kogevaximarinelatesa.pdfIn PDF document text
- https://shih-tzu.ro/files/file/dazulomukigoz.pdfIn PDF document text
- http://gr-chem.com/upload/files/48044108286.pdfIn PDF document text
- https://volnynaklad.cz/data/file/judunulujidojaxifowizesiz.pdfIn PDF document text
- http://tandprotheses.com/ckfinder/userfiles/files/36466987447.pdfIn PDF document text
- https://nhuadailoan.vn/upload/userfiles/files/71502968711.pdfIn PDF document text
- https://thinkglobalcompliance.com/ckfinder/userfiles/files/boxegofura.pdfIn PDF document text
- http://dinhvi5s.com/images/newtech/files/9912107222.pdfIn PDF document text
- http://neurooperations.com/ckfinder/userfiles/files/97169032424.pdfIn PDF document text
- https://bravo-hk.com/userfiles/file/gakedaxupefifikelum.pdfIn PDF document text
- http://prospekt-rostov.ru/ckfinder/userfiles/files/56532152475.pdfIn PDF document text
- https://alteanetworks.fr/img/file/koxegisidevow.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_off0000c8ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8ED	17016 bytes
SHA-256: `45be0703fc1781c16ca2b3c6d38807b64e249db346855cfa8377785da4c25bcf`
`font_01_sfnt_off0000f4c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4C7	10732 bytes
SHA-256: `8f42686a3aadfef9ab36f0085434d3e19ba2e29f0ce62f17b1c82df2542e7878`
`font_02_sfnt_off00010d46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D46	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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