PDF malware analysis — malicious · ce1d3ba276f1b5fb

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 21:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6ce320ede6a6f001ff2eb60f98d49a63 SHA-1: e5d2a38f714f1f8662427d84dc55fd30d3be0e28 SHA-256: ce1d3ba276f1b5fba325263a20174bb57f89e81c9ff86bf471e0e3ba5aee082f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable PDF files hosted on various domains, indicating a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the sample's structure as a link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://kaemsp.org/upload/editor/file/32730253411.pdf In PDF document text
- https://durimawar.com/contents/files/76441340682.pdfIn PDF document text
- https://proektasis.gr/admin/spaw2/uploads/files/xituvemuluvatato.pdfIn PDF document text
- http://escritacontabilidade.net/fotos/news/file/kugafibupebuxana.pdfIn PDF document text
- http://year-c.com/upload_fck/file/2021-9-17/20210917111329104197.pdfIn PDF document text
- http://casaatlantida.com/userfiles/file///wokuxafure.pdfIn PDF document text
- http://ibconsulting.it/userfiles/files/19254698212.pdfIn PDF document text
- http://boekenwinkelindex.nl/images/uploads/48888654985.pdfIn PDF document text
- http://seosanhrd.com/userfiles/file/52461828652.pdfIn PDF document text
- http://www.alfapilates.pl/upload/file/sigukax.pdfIn PDF document text
- https://interior-mark.com/ckfinder/userfiles/files/mapiketeziweropud.pdfIn PDF document text
- http://mundori.com/js/ckfinder/userfiles/files/40755632832.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/jipegodifedeminati.pdfIn PDF document text
- https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/66141043317.pdfIn PDF document text
- http://osmed.cz/app/webroot/files/files/39690019520.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133919550ef0---zokimafumimunevu.pdfIn PDF document text
- http://clubselectionvoyages.net/images/file/bolifufobupizud.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a622b844a---fuxopenerofeletifabekam.pdfIn PDF document text
- https://nutrishop.in/ci/userfiles/files/87872664149.pdfIn PDF document text
- http://formpart.com/upload/ckfinder/files/bumedenawera.pdfIn PDF document text
- http://tjsijiqing.com/ckfinder/userfiles/files/2021/0905/f2401c43beb0978a5824bb4ba974bf86.pdfIn PDF document text
- https://clinicscrm.com/img/files/77784672592.pdfIn PDF document text
- http://mrspk.com/ckfinder/userfiles/files/delosito.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+offline+football+gamesPDF link annotation
- 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_off0000cb49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB49	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e35b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE35B	16604 bytes
SHA-256: `1a667296d9a22768afacc3062a647102285602093718cffa9b0f6b66fdc94210`
`font_02_sfnt_off00010e2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E2A	10676 bytes
SHA-256: `0637d454959f594c1160c5c82e53c6bf53b30ec954d3c87df17d653e15622bc3`

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