Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ab43e15f4244ed…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 20:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09513f8a7a5343a925473150d5b4b7a5 SHA-1: 0ab9a53b04c0b5af97e39363904e4ea396856e9d SHA-256: f5ab43e15f4244ed13f7f222429d7523aabc7a62f3755db342b4c385eebf07a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URLs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=true+skate+mod
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/34333526088.pdf
    • https://sanaspinler.net/calisma2/files/uploads/40191115577.pdf
    • http://polishingmarblefloor.it/userfiles/files/40238279670.pdf
    • http://knowleangling.co.uk/ckfinder/userfiles/files/pixupivekibeborawamirexe.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161373a963e43b---69431205181.pdf
    • http://enovosti.info/ckfinder/userfiles/files/81863918803.pdf
    • http://avanti.pl/userfiles/file/17749394254.pdf
    • https://olajpark.hu/files/files/97443656576.pdf
    • http://tjsyjdq.com/v15/Upload/file/202193057218803.pdf
    • http://villalapinetafavignana.it/userfiles/files/muwibodubado.pdf
    • https://dcimx.com/files/61101585502.pdf
    • http://ieltsadd.ir/cache/fck_files/file/nejup.pdf
    • https://razredna-nastava.net/files/bajabugogalotugasonenela.pdf
    • http://gomientrung.vn/uploads/image/files/mabumenadow.pdf
    • https://maintogelonline.bet/contents/files/15147700574.pdf
    • https://priscar.com/documents/files/17416565912.pdf
    • http://ideal-site.ru/userfiles/file/97746471978.pdf
    • https://zebcom.in/userfiles/file/maromil.pdf
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/81555386164.pdf
    • https://nutrishop.in/ci/userfiles/files/fesutiz.pdf
    • http://vititanon.com/user_img/files/nopuxarilijevufivixewofa.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_off0000d66c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 16792 bytes
font_01_sfnt_off0000ee7e.bin
980335f2246a06e60f360176b02958ac7181881fb51d037a775afa9cb346bcd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 17524 bytes
font_02_sfnt_off00011c06.bin
d583c92968f72472d8d3221e93a8ee3e940bf0f2ba3c56703b66a7ca8d318983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 10320 bytes

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