Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5c61037157d3f9…

MALICIOUS

PDF

79.3 KB Created: 2021-06-07 10:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0e6e59eecdb5004d5b6cd243848306a1 SHA-1: df4949a3d27ff4905301e71ab9cc806c1e62b527 SHA-256: fa5c61037157d3f910c7d9249bb19fa2e9d48e9d95c93bfa50065a9fa35e37ec
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including one pointing to 'irlanc.ru', suggests a potential phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to lure users to external resources, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/pbw?utm_term=un+papillon+dans+la+cite+summary+chapter+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460476/normal_603fa5fd10e17.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366005/normal_60b6bc1065d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_605bb0ca67c13.pdfIn PDF document text
    • https://rawitexebava.weebly.com/uploads/1/3/4/4/134487877/foranezug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_60180a3f4103e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_60097d537ad7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_60583e1a66014.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489595/normal_5ff41b86a40a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_602858e5b904b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493569/normal_5ffca2571f378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_5ffd7d0be5cc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473384/normal_601279eb67859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443578/normal_5ff0a89341bb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/072560c3-a28e-471d-a00c-a89ecf9c1891/xekizuwudukekifikuworoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62639483-8b46-4dac-a486-143cb978b58b/2007_toyota_camry_factory_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0eb06a-e50b-4bd6-97b4-d2c28600fa5d/criterios_diagnosticos_para_trombosis_venosa_profunda.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_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 5456 bytes
SHA-256: 083e4113f0ee025b5e71e75158c61775a667c87e3c7fb13cc13535cde4d5b10a
font_01_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 11416 bytes
SHA-256: f33607db10fdb3b5de547d20660709a3a94d1ede2f63edfd76a588b275457a18

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