Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc780077fa04cd39…

MALICIOUS

PDF

71.8 KB Created: 2021-02-08 09:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c992a4dfe5f8a3715658873886bbbf64 SHA-1: 88379912e09087fe7f067aa4d09960f1ebe20643 SHA-256: fc780077fa04cd39c6a2ca4a4185f5b0b8e63d254c3bbb5ac3abe06b195accb7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/aws?utm_term=ansi+c+standard+library+pdf'. This indicates an attempt to lure the user to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/aws?utm_term=ansi+c+standard+library+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417827/normal_5ffe638846b57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_5fdc1c16b149d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425726/normal_5ff85e8491810.pdfIn PDF document text
    • https://xaviloxoganobe.weebly.com/uploads/1/3/1/3/131383750/jedemefovukelog.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/uhjjijc/luguduw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5ffa87ace2be7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5ffc16a2912a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5ffb988f2d530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5fed3bec119e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_60090eb425a95.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/mubodalejumipekad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_60142a93046bb.pdfIn PDF document text
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/dae4b0d4050.pdfIn PDF document text
    • https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/zesiwisikebunopifeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_601e1f324cec9.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/tofizo/consumer_reports_crib_mattress_buying_guide.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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 5380 bytes
SHA-256: 421b52e033f153f5b0add72dcfc39fdac7089e2cc8b8d18fc09da14577733ea5
font_01_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 12328 bytes
SHA-256: 2b9e0052f260a8b43763d158b53feaaa5b7d7fa6ef41778923112e9035526e70

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