Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daf2942567355b8…

MALICIOUS

PDF

155.6 KB Created: 2020-11-17 14:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d92c392b9ac08a132900fa238f62f583 SHA-1: 1f0a0bc78c12796f403f6a1653d0d89af01706a6 SHA-256: 5daf2942567355b8d24599d25c4beed6e5941e2ae2f79b31b7d201edb3e1c48b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a phishing or malware download site. The embedded text and file metadata suggest a lure related to educational materials, specifically an 'acellus answer key pdf algebra 1'. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=acellus+answer+key+pdf+algebra+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f92781dad526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fa781eff2fa5.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/f9b001cb-8d96-43f0-a015-9ca05e2a58ec/oc_x_toy_chica_lemon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce11d46f-b7fd-45cc-a738-4bcc154e1033/sufugixoleribetebavuwujox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518d436e-650a-4326-8521-1f5c3c124644/zarisevamit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10c72ec-f8db-46b5-8629-fb91bd7bfdf3/nenetojatepilagegeri.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/jofusimekusesobomokut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8702a3e7-e68e-46a8-9dda-aa6c85976678/puvubujofirikararalof.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/campbell_ap_biology_10th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab0d58c-983d-41c8-91c3-973bed8e5531/nf_lost_in_the_moment_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60a82fc-4616-4a11-a704-e73ca1e94607/77875657469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be189f6-8872-4b59-b8a6-087d9f53f647/89953122854.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/zikadupob.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_off0002288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2288C 5764 bytes
SHA-256: ada91e1327e1dff9afe1cde8e18b64201b9560997bdac13b0e76b8d895dbf226
font_01_sfnt_off00023c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C5D 10856 bytes
SHA-256: e73dd72b81deb9a2431902e6c6bcf033161cff3db0713979d1b8016cbd39dabf

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