Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4887d253405cd17…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 14:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f45f610b19f0fe523c4d293549ad688f SHA-1: 01d32d2e2d6ec57024bbada608d98347c705035e SHA-256: c4887d253405cd171ebdea4c0b85847289800eb66770bb0136df1073b75fd0fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ana-jsc.com/upload/files/94491005071.pdf In PDF document text
    • http://hamzalegalservices.com/userfiles/file/xosimelef.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/94752405873.pdfIn PDF document text
    • http://vhktn.at/images/content/files/70359249951.pdfIn PDF document text
    • http://hangzhou.chinatupai.com/web/js/ckfinder/userfiles/files/wakigoxovifupan.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210921213728.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/42581252587.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/57748476650.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/9042448178.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/mugarusetotemepitipivodu.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/junowuledatubewegepiwim.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/69907212620.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/28672713530.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210904_7B5AE316EA339FF4.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613145c37aac1---masisat.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210922042810.pdfIn PDF document text
    • http://innotack.com/userfiles/files/tebadilanisamud.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/dovodolaletefomajob.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/72260853694.pdfIn PDF document text
    • https://wasael.com/userfiles/file/61577853854.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/tubipo.pdfIn PDF document text
    • https://zzhqhi.com/d/files/nedapenenum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+create+a+widget+androidPDF link annotation
    • 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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 17376 bytes
SHA-256: 84a6f89d8eb7d125b571e6c6b1974681d7e2caf712503e87c96c31c742a69050
font_01_sfnt_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 10408 bytes
SHA-256: bf1225774f08bac196993744a6c2ea38c3d6bd0ab5b5e40d480d3bf422ce1513
font_02_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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