Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b905b4848d77d5…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 12:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 648e00caf789298f7be2ccafaded29e6 SHA-1: d724629bd0403391a283512a3e2720f115f7bd1b SHA-256: 32b905b4848d77d57922e79535432500c560fed352f615759640ed99983c43e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=different+types+of+learners+kinesthetic
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ude8em00ur974ehdsm4qiemesm/33238911343.pdf
    • https://wildarium.com/ckfinder/userfiles/files/35333695437.pdf
    • https://ahirealty.in/admin/userfiles/files/mupivimafeti.pdf
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/xibifavubajobofu.pdf
    • http://autobedrijvenindex.nl/images/uploads/85591343608.pdf
    • http://rasmesafar.net/basefile/basefiles/jevorumegujanufawamuz.pdf
    • http://erbaytag.com/resimler/files/98487467432.pdf
    • http://ctcinsulator.com/uploads/file/lenipomakejimonozigi.pdf
    • https://war-old.its.vn/new/userfiles/file/xoxusevi.pdf
    • http://hanasushichoice.com/uploads/files/jijadasotosulubilal.pdf
    • https://monyetjoget.com/contents/files/63015571787.pdf
    • http://archpiudue.com/userfiles/files/54703962390.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/64019326425.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/78248737913.pdf
    • http://vo23.ru/upload/file/vatagib.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16140bec2dd0f8---vodegoxaxedelidev.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/kefuxarilopotixuguwef.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/finano.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-3/20210903060059447718.pdf
    • http://solartgaleria.hu/images/file/tunarorese.pdf
    • https://wrd13.com/force/file/18700887291.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_off0000b307.bin
a227f82dc8ac4596d841ed3db1a9842f7b9b119e12abe7f50d2d82fcf6076261		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB307 15832 bytes
font_01_sfnt_off0000db7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 16792 bytes
font_02_sfnt_off0000f393.bin
465932f6e1e37f7e83630df36d11e7138ca17dac2685f8c6059a7fcf982b2def		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10784 bytes

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