Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf036fbc4d74f3d5…

MALICIOUS

PDF

73.9 KB Created: 2021-03-17 17:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 398f38a8293ac6c43b3d8b17bddf7e4d SHA-1: ea523a3201a8e50f90e3cb88bc53279c9266dadd SHA-256: bf036fbc4d74f3d539204fb2ef8e5c55af3b160195e5947b513ba9a33422a422
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 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.
  • 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://pelibifir.ru/wix?keyword=financial+accounting+harrison+9th+edition+pdf PDF link annotation
    • http://jaxifas.getenjoyment.net/78146513305.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/qC0ggjz/galaxy_theatre_riverbank_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/liahbVv/growtopia_free_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/jdjigus/nintendo_switch_online_store_refund.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_601ae01c7e893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5fcc455e7ccc5.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/cPmoTfl/80999358048.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/gfhe8ii/48099814101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488558/normal_600e6ea7aa818.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/ihxMhe3/cobb_grand_10_cinemas_winter_haven_fl.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/alleluia_eric_whitacre.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_4929f0e17409462eb4c7e50a3e8e07e7.pdf?index=trueIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/29299163251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76228080-3422-4938-9fa8-f1527d9bc15b/fopesuxerususonibo.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_ac5db04f2f214c8895d851c2954ac623.pdf?index=trueIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/roxokawaguvonozul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897ed60e-dc60-4a81-9e21-fc9aadd4401a/the_explosive_child_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f8edb7-4b18-48c1-a483-736d75d3ce87/39379279542.pdfIn PDF document text
    • http://luzojora.atwebpages.com/vupozugareguxa.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_8ce020dab25f4b369bd4e168ebc9ac60.pdf?index=trueIn 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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 5528 bytes
SHA-256: 8378833daacd8ad7d39cca60f4c85a52b421b4cdbe6ce6b3b5e64bf640d627ca
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 10700 bytes
SHA-256: 3e2318e4bd5f984206cf978841401c3a63600614f9e705c789c8ad1ad1aa07c8

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