Malicious PDF — malware analysis report

Static analysis result for SHA-256 656cbc42199dca21…

MALICIOUS

PDF

81.6 KB Created: 2021-02-16 11:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ad0874506e02c790a2d42afcdf57d316 SHA-1: 3ce5b9ad01f1eea37a8ae8cf6bab91af4df3e2ca SHA-256: 656cbc42199dca215cdb843c779a8b97c966ff68434ade04cc834c4e9344b5d5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=que+es+una+tabla+de+contenidos+en+word PDF link annotation
    • https://zekawumili.weebly.com/uploads/1/3/4/4/134403966/sizatuzuw_sipuvaninisejep.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/48244432715.pdfIn PDF document text
    • https://pevapulef.weebly.com/uploads/1/3/5/9/135979240/9578254.pdfIn PDF document text
    • https://dunifavopugi.weebly.com/uploads/1/3/5/3/135312205/senolilikurezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_5fd0fe0d9e21c.pdfIn PDF document text
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/texililuxivixej-lezed-foxej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470211/normal_5fd0d66725023.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banugigo.epizy.com/xitadixixomudelusad.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/80437875577.pdfIn PDF document text
    • http://vivimaga.epizy.com/47340042039.pdfIn PDF document text
    • http://lorabedujeweb.epizy.com/33620330734.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/wosasosesise.pdfIn PDF document text
    • http://kejufunekopal.epizy.com/about_us_page_template_bootstrap_4.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/algebra_1_factoring_review_worksheet_answers.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 6832 bytes
SHA-256: 0d60b0745bb1009bf8bf92213af8976a8e4648609539f740e2609cb3c49ebfeb
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 5228 bytes
SHA-256: 7c51d49e54dff44499a299b77f5ac9f92ab3bea79c4d3249f358ce1ca89d48c4
font_02_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 11416 bytes
SHA-256: 9833a13fe57c4caf5b0b75f790735263ee02a6a14b97f9086f65633035b90b6a
font_03_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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