PDF malware analysis — malicious · 20e5e287fe36b1de

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 07:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: cd55cac0ce5114bd1b6c24a5854b242b SHA-1: 31a548445f02e9df7167c5a09dc462182aadfbe6 SHA-256: 20e5e287fe36b1deff16b07a67205ce1e8203550d091c92ef589b765e328fad2

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous external URIs, many pointing to link farms and disposable hosting, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristic firings strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 5

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.
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://crysiq.ru/uplcv?utm_term=download+need+for+speed+apk+and+obb PDF link annotation
- http://dyneco.kr/userData/board/file/71304466580.pdfIn PDF document text
- http://de.ruben.pl/ckfinder/userfiles/files/1383283672.pdfIn PDF document text
- https://www.adoz.cz/ckfinder/userfiles/files/31992731650.pdfIn PDF document text
- https://gitteszoneklinik.dk/ckfinder/userfiles/files/89380303908.pdfIn PDF document text
- http://refinerlink.com/userfiles/file/jawuwelawofe.pdfIn PDF document text
- https://xn--80aggmy8c6c.net/UserFiles/File/bamilaveragelol.pdfIn PDF document text
- https://menu2uplus.com/images/file/40207126305.pdfIn PDF document text
- https://propertiproperty.com/Uploads/userfiles/files/vudakunixopasezolaniket.pdfIn PDF document text
- http://coyada.com/up_images/up_images/zulit.pdfIn PDF document text
- http://hifitness.hu/userfiles/file/74181512859.pdfIn PDF document text
- http://freeorden.com/media/file/87421421151.pdfIn PDF document text
- http://tns-china.cn/editor_upload_image/file/64927933945.pdfIn PDF document text
- http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c2db8d7bbc5804060bba155c01d8f525/92559012192.pdfIn PDF document text
- http://zamgph.com/uploads/file/010646385646.pdfIn PDF document text
- http://mylead-journey.mandiricareer.net/contents/files/82429014344.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/30173077407.pdfIn PDF document text
- http://unityproductions.com/upload/files/88941045453.pdfIn PDF document text
- http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/mutarevaxepuwoseneb.pdfIn PDF document text
- http://westhollywood.ilovepokebar.com/uploads/files/36840717858.pdfIn PDF document text
- https://wasael.com/userfiles/file/3328009239.pdfIn PDF document text
- http://e-junghan.com/userData/board/file/tegelateso.pdfIn PDF document text
- http://joyerialaplaza.com/ckfinder/userfiles/files/roloza.pdfIn PDF document text
- https://cingenito.ca/upload/editor/file/15047753247.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5268b5952eac38ec88b22d8c00a8855c/sikitewulilogav.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_off0000b164.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB164	16540 bytes
SHA-256: `7afc0d08552814603048e921e5394b7341dc384dbf87c94b99f479d35ac7f6e2`
`font_01_sfnt_off0000db1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB1E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f335.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF335	10620 bytes
SHA-256: `feeed132ee0a534d28182fea70b32385aac87071beef4c6e93dc137b6e33edb9`

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