Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7c5f865bcf75b6…

MALICIOUS

PDF

77.2 KB Created: 2021-04-25 02:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a76d757e99d426310023b2e7267ac93 SHA-1: 1812997e8e2dc74c49e2fcfd94a332a8c7b478d4 SHA-256: 8b7c5f865bcf75b6804c3f9bc1eebd28caa5b0357fd4bdd9ad04fae011434565
126 Risk Score

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 0.9998

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 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://botokaw.ru/strik?utm_term=best+intermediate+weightlifting+program+reddit PDF link annotation
    • http://legko.travel/palm_tree_cad_block_free93ytf.pdfIn PDF document text
    • http://good-production18.site/29278449397ir9gw.pdfIn PDF document text
    • https://woluxubofij.weebly.com/uploads/1/3/1/3/131383763/8541578.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/examen_matematicas_5_primaria_santilhdj9y.pdfIn PDF document text
    • https://vibofigejud.weebly.com/uploads/1/3/0/7/130740502/6845436.pdfIn PDF document text
    • https://kamefumude.weebly.com/uploads/1/3/4/0/134018396/4442990.pdfIn PDF document text
    • https://zesidorav.weebly.com/uploads/1/3/1/4/131437831/9638875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_3a1f8d0d3bd14ac284b285d5daf26752.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/nizusiwifofaba.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/best_reader_windows_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/how_much_does_a_forklift_licence_cost_uk.pdfIn PDF document text
    • http://demunoj.epizy.com/viktor_frankl_mans_search_for_meaning_summary_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/87704178489.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_3f8b3186ea2d4c3db609633ca4209287.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/diagrama_de_clases_uml_online_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/bhagyanagar_arithmetic_reasoning_telugu.pdfIn PDF document text
    • http://newewixojarulup.epizy.com/xilugog.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_171cdcbad8294e13bdf95c54081786cd.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_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 5596 bytes
SHA-256: 0895f7935e935824acb3fbe7275c6060d74980ed3e3557a01184e79e8db097e2
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 11592 bytes
SHA-256: b994bf750c8b364cf8f1ca370e1f73c01d3aa0a39135783d0cd4dc4e57842bd0

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