Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b1ae5c68ca20f8…

MALICIOUS

PDF

86.1 KB Created: 2021-03-16 18:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cfae056d28260cf8cf265eea742cec52 SHA-1: fe39138aa05835a9350b64131f1c2b51c5f2edef SHA-256: 43b1ae5c68ca20f849d1d30983e681770f56df737e5bb6d673aed285ceb4060a
156 Risk Score

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 0.9998

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 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.
  • 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://midufefew.ru/award?keyword=admin+clerk+duties+and+responsibilities+pdf PDF link annotation
    • http://zugasanuko.getenjoyment.net/38340770533.pdfIn PDF document text
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/9f2284e.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/mamum.pdfIn PDF document text
    • http://mogabaketenis.iblogger.org/how_to_replace_lower_hose_on_shark_navigator_vacuum.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/levumoduf/3647268032.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/new_headway_upper_intermediate_workbook_answers.pdfIn PDF document text
    • http://jaxejibowanub.rf.gd/contemplated_legal_definition.pdfIn PDF document text
    • http://xekamala.epizy.com/39164365717.pdfIn PDF document text
    • http://lavuradisaxel.epizy.com/hyperplasie_des_cellules_caliciformes.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_3ff98fb8e76b44eca9e23aedbb3c0c9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/97198769124.pdfIn PDF document text
    • http://muvasusug.epizy.com/furosemide_medication_guide.pdfIn PDF document text
    • http://judewal.rf.gd/javunekekovexepuzejelagog.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_fcc6f4bfd6f44878828f859ac7a6089d.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_943c1c7cc347471794fffd63b5550945.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/xememufefelexoletasubesu.pdfIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_0b6fda5db52144d0bab2ff9e317df13d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/gate_mathematics_syllabus.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/85563572065.pdfIn PDF document text
    • http://zigerakujig.rf.gd/funirigul.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_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 5492 bytes
SHA-256: 6f820b77f46d2f0e8254d25ae0f8d64a8f39ac649ee890493f97163ed28f23f3
font_01_sfnt_off000126da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DA 10664 bytes
SHA-256: ba7511b22f2a7306e18547442a7c6705e7d876df080b6256d2c01ed03bfc7e19

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