Malicious PDF — malware analysis report

Static analysis result for SHA-256 770fb63ab9478734…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 11:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74789840541d976d828b64d11aaa74f8 SHA-1: 4d345d806401d412c03f4d93059abf6b7fe16f94 SHA-256: 770fb63ab94787342e109a7a227e8674d5af63baa0e73214fa4af2601b178960
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers. The PDF also contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://inwebjor.ru/uplcv?utm_term=farmville+2+country+escape+hack+apk
    • http://lycee-elm.info/userfiles/file/30879179756.pdf
    • https://artedeeducar.com.br/ckfinder/userfiles/files/70718891870.pdf
    • http://sunnysolutions.it/uploads/assets/file/63630505914.pdf
    • https://halkum.rs/files/wokapukubisifofi.pdf
    • http://krevue.cz/UserFiles/File/63579302810.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6b8771f684dae81b24ca75c22441aa48/98394650026.pdf
    • http://innotec-industrie.be/userfiles/file/13017894224.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/34321972914.pdf
    • http://njxinbell.com/upload/files/moledifadijalotikopese.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/livabutiwanin.pdf
    • https://bayihoki99.com/contents/files/gemotosojem.pdf
    • http://eca.or.th/ckfinder/userfiles/files/darobamunimepuratuw.pdf
    • http://adacu.org/userfiles/file/20210912035228.pdf
    • http://delve-cr.com/uploads/donizuwipesiselunem.pdf
    • http://soupworld.de/upload/file/7385361524.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/5006221256.pdf
    • http://www.shjkyq.com/up_files/FCK/file/nimarepojekuren.pdf
    • http://zhuoxinlaw.com/userfiles/file/20210906085601_1520924550.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/84743545975.pdf
    • http://evohome.pl/userfiles/file/mewefasumumizavanupeg.pdf
    • http://artpolinakuzina.ru/pict/file/10603590535.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c71106469b22d44dd795ebe4420faff0/62248902817.pdf
    • http://usatovl.ru/upload/fckeditorfile/3602950278.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c2.bin
b6306c819eb5a04321cbc9333015783b1851dac40630b32efa07e287851abe6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C2 11108 bytes
font_01_sfnt_off0000db95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 16792 bytes
font_02_sfnt_off0000f3a7.bin
bc7397f4fb5f982b2b6347b11cf347a138509db9080672741c05dcbcae248ce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 21812 bytes
font_03_sfnt_off00012a2b.bin
b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 1868 bytes

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