Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f52e3159a6e9ac1…

MALICIOUS

PDF

94.6 KB Created: 2021-09-13 23:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9d3a880a1ede946d4bdc0be83f427e2 SHA-1: 5de911b68188d1a0443b1515143dbedbc22a2e84 SHA-256: 0f52e3159a6e9ac1abb99cdd51708998a24c9180693cd7979a87f7b75a4e6318
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=minecraft+city+shop+ideas PDF link annotation
    • https://pchome.uzai.ca/upload/files/xurep.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/4494593165.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/wusakoregepupofedezur.pdfIn PDF document text
    • https://digireg.si/upload/66522750798.pdfIn PDF document text
    • http://wajl.net/img/file/202191122032.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/tusizanizaximonitopikut.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/vivuba.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/69944290364.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb3a4beb2---tuzajovelel.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/sajakuwote.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210913181153.pdfIn PDF document text
    • https://beaszemin.com/files/88086642282.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/79470884048.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///bigilodigujaxavunurex.pdfIn PDF document text
    • http://ajambary.com/userfiles/file/72100740225.pdfIn PDF document text
    • http://dlzj.net/upload/files/202109080315393722.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/xofasimewuvosawusom.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/xisix.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/92971422756.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/36671264487.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/84254355746.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/gasimeva.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_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 10776 bytes
SHA-256: fb46b0cff9f1a9eb8ac9a1f5e39c3d64433f1fd07068004d67d110ac6908fb01
font_01_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 20620 bytes
SHA-256: 66b896857b41fafc038906a168d85bb663f264e9afbad682113f38f0eb693b98
font_02_sfnt_off000154f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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