Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c936fd4ba49070…

MALICIOUS

PDF

73.7 KB Created: 2020-11-20 17:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 40da9d388bf36f24bd5c51da43808173 SHA-1: d18fd4bd949f9136ca3173890927c67831c2e66a SHA-256: d9c936fd4ba49070678b2c51259d41062b36dab24cd41b7fb94e2064341d0c9a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a large number of external links, specifically identified as a 'PDF_SEO_LINK_FARM', suggests a malicious intent to manipulate search results or redirect users to potentially harmful content. While no scripts were extracted, the overall structure and heuristic firings strongly indicate a phishing or malicious redirection attempt.

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://trafficel.ru/123?utm_term=handbook+of+enteral+meds PDF link annotation
    • https://vimikipemaw.weebly.com/uploads/1/3/4/3/134331773/nusupubolosax.pdfIn PDF document text
    • https://jasasenud.weebly.com/uploads/1/3/4/1/134131975/6521682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5f89168af3a81.pdfIn PDF document text
    • https://mulevemi.weebly.com/uploads/1/3/4/7/134754511/pivirizolir_lekiged_sixozore_kidutetu.pdfIn PDF document text
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/9945175.pdfIn PDF document text
    • https://susetizumuru.weebly.com/uploads/1/3/4/4/134461935/9756257.pdfIn PDF document text
    • https://warobakun.weebly.com/uploads/1/3/4/4/134486798/gebewapupazafab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_5fa9ce427ea2e.pdfIn PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/4004344.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/purawuma/39911124879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44b1de1-e7b9-483b-8eb4-277af5367b98/megaman_x4_best_boss_order.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/conditional_progress_release_template.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/disemboweled_husk_cheese.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/mozetulitejepom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab2839a-bb3d-494d-bb11-8645fe688fe3/dewalt_dxpw4240_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/58799746549.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_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 5216 bytes
SHA-256: 070d6a209cc0cf56adf665cc68038d53dbf52ff9125436ef50629f881c04e03e
font_01_sfnt_off0000f6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 10480 bytes
SHA-256: 89ed8cf68d16d5028f95b0db829c76b6de172c1cf77a4837e48d0932271954cf

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