Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3dc1237965a098…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 14:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c58b5da3c4f0b474870840530e58ba1 SHA-1: 3e1add8c2a90414ea7024f0d8eee807088083e81 SHA-256: ec3dc1237965a098ded3d5e8f81c4eeec61d80fb59c4a6a92ae59ac644b2ba67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, including one that appears to be a link farm with UTM parameters, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=pubg+mobile+1.3+update+apk+download PDF link annotation
    • http://fuerst-architects.com/uploads/file/66903086621.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/97083108832.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9684b780---tabenodonizokebamaxopope.pdfIn PDF document text
    • https://greenways.at/userfiles/file/bedenipekavujer.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/46754428819.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/sisodatuj.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/62692461873.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/dusetefulikuterijodumiduj.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/zixazilibinijariborer.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/lofajanekanivona.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/xupaxi.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/fovadufawedoja.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/pawisijazikonuwa.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/39285148413.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/bebejewunomomep.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/69886531440.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/putedapigutofokemuvef.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/90554924789.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109130615535233.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/73084624465.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/98271614128.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/4763002180.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_off0000b975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB975 16920 bytes
SHA-256: d45e7a64ef51b7c28176be38d31f9a2775859febb62cd5311c0bdc292f913665
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 11176 bytes
SHA-256: 84c1eab80a87fbb70660ae133701cf78ff78c21f23b4e98fa2c0c0d7e6b3c626

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