Malicious PDF — malware analysis report

Static analysis result for SHA-256 12382649a83bf0b0…

MALICIOUS

PDF

95.4 KB Created: 2021-09-19 01:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6ee9973619ce334b4c7d3ea62cda237 SHA-1: ddbb9cb6c8277fc713dbcab7cecb459984d2893e SHA-256: 12382649a83bf0b00c8f3969e6a9e79330431c923ce2655a91c85d3c3de42b2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to suspicious domains and disguised as PDF files, suggesting a link farm or redirection mechanism to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://metrosecuritynepal.com/assets/userfiles/files/lagiti.pdf
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/korurujuridosiwefosekox.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/likuzapewidekiru.pdf
    • http://hamzalegalservices.com/userfiles/file/9633571557.pdf
    • http://leskovec.eu/files/file/binugesuvelodifapuzif.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/7722025304.pdf
    • https://masihpt2.com/contents/files/xabiwukuzuna.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16135f95b0caa2---figojuropixiwasor.pdf
    • http://hzzxtl.com/UploadFile/file/20210903130452932.pdf
    • http://nincity.de/inline/file/58397744376.pdf
    • http://bhk-aindling.de/userfiles/files/lenufogemevadasefonu.pdf
    • http://olynskiconstruction.com/pics/file/mejapiporarekifidimusa.pdf
    • http://www.rannatennis.ee/data/upfiles/files/basajumibipupozotegokule.pdf
    • https://wedding-photos.cz/userfiles/file/20274473737.pdf
    • http://to-tuong.com/media/ckfinder/files/61847235023.pdf
    • https://brianspradlin.com/userfiles/file/polexefadozosozodazotix.pdf
    • https://cafesca.org/ckfinder/userfiles/files/besigexelobunujofekogixe.pdf
    • http://cjpharmtech.com/upload/files/87065774370.pdf
    • https://arte-salon.ru/upload_picture/sedatexopileguw.pdf
    • http://indcms.testingmachines.com/images/file/tetiguxosukugugoxifir.pdf
    • http://ansonseatery.com/uploads/files/46054656972.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/navaj.pdf
    • http://aylincinarli.com/fckfiles/file/gomebogusijibegumuvewaza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+book+of+margery+kempe+translation+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_off00010f16.bin
ec3825db4fa934739d9c954b45c91898f251283efbd884fe9be5a3a4306aa538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 18120 bytes
font_01_sfnt_off00013da1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA1 16792 bytes
font_02_sfnt_off000155b8.bin
b23a7e621676e19427687ed1f09a4212244722e0f3ece11898fb9818ab062f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155B8 11252 bytes

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