Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf3acfeb8032f8f…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 21:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c75c2695ca1583d6290d151313b30db2 SHA-1: c571524317b75feece2caf11a7fa9ba94583307b SHA-256: acf3acfeb8032f8f2797472978cc58719eaaf0eafa98ebc8c7caa60737ce4c1b
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms that the document is a link farm on disposable hosting, suggesting a phishing or scam campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://progettocecinacuore.it/writable/public/userfiles/file/setilabugowuxopoworofuv.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/57f7735ff4fc3611165845fb65b2d1af/12289747137.pdf
    • http://855solution.com/htdocs/cljr/data/files/wabanonejoveriwosu.pdf
    • http://oodow.cn/upload/file/210913225015551077udgeo6xyrs5r.pdf
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/fesezimapadutekifodid.pdf
    • http://pxmonastery.org/CKEdit/upload/files/90813509586.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f98b2232300e93609779f2b0d62dac6b/93176543954.pdf
    • http://sanalights.com/admin/admin/uploadfiles/file/bonabulekojimosej.pdf
    • https://sitarasign.ir/data/file/bikoxini.pdf
    • http://be-now.pl/userfiles/file/18844093505.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/84818215790.pdf
    • http://bociany.sk/media/file/25683151790.pdf
    • http://thaifilmind.com/UserFiles/file/80843647965.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/zopemelipunijuj.pdf
    • http://hyunsin.net/userfiles/file/firejimufak.pdf
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/12317942793.pdf
    • https://liepasmuiza.lv/userfiles/library/sururesovopitomufatexono.pdf
    • http://bdn10.cz/files/file/78990786429.pdf
    • http://haiannweb.com/uploads/files/jepisejagux.pdf
    • https://purefeeling8.com/data/file/mefupupefif.pdf
    • https://mediaskills.rs/files/88189201677.pdf
    • http://aescantabria.es/upload/fckeditor/file///zurobogojivomigavinizo.pdf
    • https://jjpremiers.com/files/80235590068.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+androids+facetime
    • 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_off0000b0b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 16792 bytes
font_01_sfnt_off0000c8cd.bin
808a44722d42be2a62af9ba91ec1365350dfb0513052f9468e06205ecce68b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 10688 bytes
font_02_sfnt_off0000e129.bin
1c1151ef0eb6eab8f7549ee55209e3accd363ca8fd1c3df1806038c950114e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 17592 bytes

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