Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88f14a490797d32…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 00:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7497b81d6bc6676fd3ac963ec7493650 SHA-1: 0fbceb3882c37d7bd34b222757e6885c7ee523f7 SHA-256: d88f14a490797d3209a6aa075296ae30eff38edb0b452cdce683c94cbdc908b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a medium-severity rule indicating it is a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely lead to phishing sites or malware downloads, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://queure.ru/uplcv?utm_term=data+recovery+apk+mod PDF link annotation
    • http://ventima.ru/userfiles/file/19358694082.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/82989101665.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/14829074834.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614130665dd15---21625486125.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/36552949334.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nejoxanokuzubemajadudugi.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/nhk4fi5f8momu41c0jfen16s6p/milapajazewusitoluvo.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/wabumegewexanugilapilo.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/panofeja.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/milodomavas.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/63235787806.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/biwaladiwo.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dalufezurisor.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/16437308113.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/47033510910.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/pigedurufelidilarozu.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/ratiduvulofuwo.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/18858043699.pdfIn PDF document text
    • https://remini.hu/userfiles/file/ruwiwemowofofid.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210913131733.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/tofimubegedurusukosipij.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/49402965829.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/nokegiza.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/37952457346.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 10536 bytes
SHA-256: 5fc6c76746fcce013e874d256d6e4770508206fdc9322cf74c55b23303ba96d5
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 20712 bytes
SHA-256: a8f4fd662830b0b9355ea195295050c87a54fede2ac092accacab64f47eae56e
font_02_sfnt_off000129a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1