Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb608e76df57819c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 05:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cfa74894367f66b0418c13614362736 SHA-1: de05610cfcbf5a72a76699f50d1143079fd50e07 SHA-256: eb608e76df57819cdba95bab9340aeaf7a98d2320003375b5e3f2c58454f478b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=nomao+camera+apk+download+2020
    • http://gemcom.org/userfiles/file/27433833426.pdf
    • http://zechnerbau.at/images/content/files/fovebojurovituw.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/11688355205.pdf
    • https://noithathoaphat11.com/upload/files/57225683470.pdf
    • https://etest.vn/app/webroot/uploads/files/17369846366.pdf
    • http://gamax-motor.cz/data/dokumenty/76209511364.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/gunumobumigu.pdf
    • https://yellowstonewildlife.com/7317046128.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/wobifafo.pdf
    • http://upnbkk.com/file_media/file_image/file/47381841171.pdf
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/wodezuxovovaxigobowulod.pdf
    • https://illustrations.noche.fr/images/files/zegumosobitakelodivuje.pdf
    • https://dlt-nkp.com/fileupload/file/59779233513.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/22176042431.pdf
    • http://tatnhapkhau.com/ckfinder/userfiles/files/loxofajet.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/9510764991.pdf
    • http://nhatrangpalace.net/app/webroot/upload/files/xoxiwinogotiduzasofogame.pdf
    • http://originalbau.hu/imagesfiles/80647885886.pdf
    • https://tyko.pl/userfiles/file/lubimiz.pdf
    • http://studiogaleazzo.eu/userfiles/files/82620182063.pdf
    • https://chineseclothingonline.com/File/89526054476.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/lutitinevegoviminam.pdf
    • http://pomocnaukowa.net/Upload/file/4422870097.pdf
    • http://www.psyforyou.nl/upload/fckeditor/file/2040780983.pdf
    • http://machulski.com/public/file/74047922812.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b26e.bin
27daaf87c443fd2c90365d2b8b60b85e573aef8bde4500c44bcdea7a88ca17e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 10712 bytes
font_01_sfnt_off0000cb1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 16792 bytes
font_02_sfnt_off0000e32e.bin
bad2cbb54147ff3faa18d1ae5bb41fb974c9ef01bf80d868cc0c2de0957feb7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 15936 bytes

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