Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4913c1b4ee2f34…

MALICIOUS

PDF

95.5 KB Created: 2021-02-25 05:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9e73868c1d489bcaff78e35ced3e1c1b SHA-1: b0a97cc1cd010d9a1d6497ed350394d1612a0bd0 SHA-256: ce4913c1b4ee2f34fd52eef462d12bcfee4f26d5ef032768276ab3812af05352
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm, indicating a phishing or spam distribution attempt. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of suspicious URLs suggests the primary attack vector is directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/wix?keyword=i+hate+the+moor+my+cause+is+hearted In PDF document text
    • http://kojazunupetip.mygamesonline.org/love_dare_book_free.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/95624320430.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/xikedoxunopul.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/9139953.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/the_law_of_the_garbage_truck_book.pdfIn PDF document text
    • http://gromstroy.com/xegesujowypo7m.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/xivap.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/nadodolexuriwib.pdfIn PDF document text
    • http://zesamoa.online/91514454269ivwgs.pdfIn PDF document text
    • https://nokejulaju.weebly.com/uploads/1/3/4/6/134696540/banijubapozirosagir.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/94538848539.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/tazukimefimowudonijibct1p.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/nejiwoserivimutujavivituk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gosete/1183021866.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/72479155660.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/java_calendar_format_am_pm.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/aging_report_in_sap_bw.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/nufaguwenirobojuzon.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/64480251533.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/97850080281.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4A 5188 bytes
SHA-256: bbca1158f25c900c1aa036c76fa80219e38536ed14103dcde3aa6491b8847892
font_01_sfnt_off00014bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC4 10240 bytes
SHA-256: d64716285268ee51365f1f120cf9e2617bb9b02104bf501c056c6aaaaed94528

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