Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e31f9e97621f3e…

MALICIOUS

PDF

75.1 KB Created: 2020-11-22 10:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a7e03b3eae41829536e37425644e679a SHA-1: b85541aa247e62e1bbf7cf04e11ba3f0aaa783c8 SHA-256: 39e31f9e97621f3e2e12839020ffe8309e6c56cbb647f2906ef0c33b49bcc97d
214 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 and routes users through malicious redirector infrastructure. 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
  • 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://cctraff.ru/123?utm_term=lowa+camino+gtx+boots In PDF document text
    • https://peledinupuw.weebly.com/uploads/1/3/4/5/134508745/443252.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/210244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476952/normal_5fb8820a3834a.pdfIn PDF document text
    • https://nusaniwufozeg.weebly.com/uploads/1/3/4/7/134751508/574741.pdfIn PDF document text
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/796a1db0a501b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/binikoruzetupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673a4147-cc94-4bad-9991-17b5e90f6793/woxubewomada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0938bf9-6766-443c-b680-9dc7ae6d7be1/17553279023.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/a_level_mathematics_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/alpha_beta_gamma_radiation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa7db27-16b4-4137-920b-968c25c92034/hitch_spare_tire_carrier_swing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56526f1-6424-489f-962a-01c54ba99426/26169827570.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/wofubon.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/78819896494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb97047-98bd-414b-9a69-e2d10c34cc3e/xidiveramusepanokumo.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/mega_cocina_electric_pressure_cooker_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 4900 bytes
SHA-256: 7fde5b5ad66c99e7c1620be15931e20790b0d051272872d471710a3b51aa95c7
font_01_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 11636 bytes
SHA-256: e3eb0900afc8e5b2b9a0d1d70db697beaa56a1f180adf417d7901999d25f919d
font_02_sfnt_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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