PDF malware analysis — malicious · ceae7be9e53a8f33

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 15:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: edabf6d1f316f1f2dae17a196f1c4b76 SHA-1: 8a93e45225547d014b44c4854eb3fdbe8b6511a3 SHA-256: ceae7be9e53a8f338f1814d9502fcf2d6e8f0aba30acb38baa0171233473db8d

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting this assessment. No scripts were extracted, but the presence of external links is the primary indicator of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=hide+apps+calculator+apk+download PDF link annotation
- http://ibshop.gr/uploads/_uploads/files/5242828433.pdfIn PDF document text
- http://chongthamnguoc.vn/img/files/45774019458.pdfIn PDF document text
- http://citadelcaralarms.com/userfiles/file/niroraviruxepe.pdfIn PDF document text
- https://zoomkish.com/basefile/zoomkishcom/files/madisasarotipuxerusonal.pdfIn PDF document text
- http://semihkerpiccilervesupersound.com/upload/file/98825122436.pdfIn PDF document text
- http://szamosiszerviz.hu/feltoltott/files/9475926817.pdfIn PDF document text
- http://music-summer-courses.eu/upload/files/birateginuwigekogekedisux.pdfIn PDF document text
- http://upoart.com/ckfinder/userfiles/files/36224334976.pdfIn PDF document text
- http://zeroseistudio.eu/userfiles/files/doxubezojisadibubumix.pdfIn PDF document text
- http://hongsung114.com/files/fckeditor/file/8249121036.pdfIn PDF document text
- https://alirezamirmohammadi.com/images/upload/files/63790058567.pdfIn PDF document text
- https://xrtradingfeedback.com/cmsimages/file/92180340181.pdfIn PDF document text
- http://svazekobciorlice.cz/userfiles/file/rimokewezir.pdfIn PDF document text
- http://consol.hu/images/uploadedimages/file/sedogerakokatodemofimime.pdfIn PDF document text
- http://chongros.com/userData/board/file/vesinawalixolijatoruw.pdfIn PDF document text
- https://ichibaninfotech.com/ckfinder/userfiles/files/30922199765.pdfIn PDF document text
- https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/24209448415.pdfIn PDF document text
- https://vilus.cz/userfiles/file/19552977456.pdfIn PDF document text
- http://pcserviszlin.cz/ckfinder/userfiles/files/zegenagopasaxeli.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_off0000d792.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD792	17688 bytes
SHA-256: `491d63dd921cf66d31a860d06f0e301d50771c0a0d3ff47130e0e2c7e813bf9c`
`font_01_sfnt_off00010591.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10591	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011da8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DA8	10776 bytes
SHA-256: `0cc040036ff4ee47918403e2b68922df1e3f903be6f0121e27525d02a390b6bc`

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