Malicious PDF — malware analysis report

Static analysis result for SHA-256 1003511410b7ba7f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 16:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 711640926fd9ebd6cf29ac71a7b45338 SHA-1: ef8061b06b7a30b48d3fbc9d379f1972c9c33d93 SHA-256: 1003511410b7ba7fa9639b46a3f5f344c1b50203cf085f97f670a5899e3a8378
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure itself appears to be exploited, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catamma.ru/uplcv?utm_term=so+you+want+to+talk+about+race+pdf+online+free
    • https://volgogradexpo.ru/ckfinder/userfiles/files/72082548596.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614246cb8b47d---ninifosokepoliligexojerin.pdf
    • http://captaincook.hu/userfiles/file/15996565689.pdf
    • http://huyndaicaudien.com/upload/files/76075804205.pdf
    • http://sbs-group.co/userfiles/files/wolumexukupasaxesivaf.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/47911074035.pdf
    • https://thuhuonglacquer.com/uploads/news_file/dumogavokewinatodijinin.pdf
    • http://cp-1.ru/userfiles/files/50931515830.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/reroril.pdf
    • https://rheinfurth.de/userfiles/file/23342220678.pdf
    • http://bestofbeer.ru/ckfinder/userfiles/files/raboroli.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/60731326753.pdf
    • http://bienchidan.org/uploads/files/28057865144.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/dobepirok.pdf
    • http://milkexim.ru/imgeditor/file/pukedukebopiwalige.pdf
    • http://goldenteriyaki.com/uploads/files/vebevisatizemezelid.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/52459526837.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/rofuxixo.pdf
    • http://ruihuitax.com/files/file/levowis.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/78009954721.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bcd56aad---veduvosevizodowu.pdf
    • http://onestep-tokyo.com/userfiles/file/26721472103.pdf
    • https://dansobentre.net/uploads/file/gulutuwikixude.pdf
    • http://manavpublicschool.org/manav/userfiles/file/80638492490.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_off0000e618.bin
c89f6fd5f9ef78fd6dde2288be15ed5c06af9aeffacaaeab9252ca6ec6a8a7da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 11052 bytes
font_01_sfnt_off0000ffd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 16792 bytes
font_02_sfnt_off000117e8.bin
fdd26970ad97cd6a72ccc8787ff1aa4001cbf78ab5c4ed16c56704840abe47fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 19056 bytes

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