Malicious PDF — malware analysis report

Static analysis result for SHA-256 759b3ff844fa7a83…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 09:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d7f35fe9ef878f35c6dbf14466d4ab8 SHA-1: 3ddd41fa05b25334c7326b4ff061df0cb9f707bb SHA-256: 759b3ff844fa7a83baf761717227e6c41d59876c65c2bb7d92f5352535ffc9e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards an attempt to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://burattinojatek.hu/userfiles/file/veboruzotusamugigokeka.pdf
    • http://flightshop.jp/images/blog/file/12446771907.pdf
    • http://group-anons.ru/userfiles/files/ferorol.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161381b6d39532---fikufuje.pdf
    • http://homelife-superstars.com/image/files/1196797115.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/975886419.pdf
    • https://classoft.ro/userfiles/file/65251400355.pdf
    • http://kukubara.com/zdjecia/file/pedalazovana.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/zedirazogitusek.pdf
    • http://namthangbasaltstone.com/uploads/image/files/69568737170.pdf
    • http://staractivecollection.com/resimler/site/files/81346632462.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/17641404891.pdf
    • https://newshieldinsurance.com/demo/gsa/final/images/file/tugavevutakatad.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/18791165186.pdf
    • http://vectorma.ru/uploads/assets/file/87238520322.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/79920318477.pdf
    • http://op-gold.com/ck_image/files/tikapodelotopixonun.pdf
    • http://irk-yoga.ru/upload/files/jomujavapazojaz.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414dd08d1c6---47380439964.pdf
    • https://enerjimakine.com/tsrm1/img/userfiles/file/xivaxizesokosimeteku.pdf
    • https://corpus.bg/files/fck/file/28651717412.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+developer+webview+example
    • 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_off0000e143.bin
0cc457fc4d3bed797695519e7cc97d41bab4fef126f692203d2b84d67c3bed19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 10660 bytes
font_01_sfnt_off0000f965.bin
4e4e25005bc8cb57d956b15df63ff9513ebf6215f02a0ccda4e251f036b5e121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 18628 bytes
font_02_sfnt_off00012ac7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 16792 bytes

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