Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a89d5338d22b1e1…

MALICIOUS

PDF

76.9 KB Created: 2021-09-22 18:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28ddd5c16ab9d615c19b45c77f7f98c4 SHA-1: 2c6ecc7d2c988ec9d20df15f8e7ab0895f974487 SHA-256: 8a89d5338d22b1e1e7b23dcc0f8d5be9a14710323b2ae5a900573ac62292b83b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan delivery mechanism. The embedded JavaScript is likely responsible for initiating the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://af.ssla.ru/images/fornews/files/29086577109.pdf
    • http://nfc-lampang.com/user_img/files/dujorejexev.pdf
    • http://wwstationery.com/files/file/memanixupomiwaxobumo.pdf
    • http://tranindo.com/Uploads/userfiles/files/58747838391.pdf
    • http://flyingkirin.com/uploadfiles/file/220048012467.pdf
    • http://sunriverps.com/data/editor/file/31045316443.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/31781687357.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/86837771960.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/66688307244.pdf
    • http://timnhanhonline.vn/upload/files/25133598191.pdf
    • http://bbdecontra.com/userfiles/files/45523131652.pdf
    • http://sys-svinding.dk/userfiles/file/jitowogumuwuwoxalixiwiba.pdf
    • https://sistemagestiondpr.co/userfiles/file/tepiwowaxoboto.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/ritufetexapebiwiwomol.pdf
    • http://sethhukumchandschool.com/userfiles/file/sabemetorivitu.pdf
    • https://novitas.ro/files/juzibaribiz.pdf
    • http://krakowska98.com/zdjecia/fck/file/womokezutinagujovigovofi.pdf
    • https://rajatotogroup4.com/contents/files/99732160535.pdf
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/68484749889.pdf
    • http://brukbet.com/user_images/file/6984861382.pdf
    • http://abw10thstreetne.com/uploads/files/pogokaretojorotebasepo.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/54219499526.pdf
    • http://akwarella.pl/user_uploads/file/34405661662.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mobile+legend+mod+apk+unlimited+diamond+no+ban
    • 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_off0000c75a.bin
7d93b519a40b1dc7f17ffe610e2be205f0f4b128b11fbcd4de4d32c0f36dab07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 10792 bytes
font_01_sfnt_off0000dfb8.bin
7dd24db1a65855b7d718634070813dddc56f7fdd6d2136d6ffc839c4b27c78f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 17628 bytes
font_02_sfnt_off00010d4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 16792 bytes

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