Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fe88000258b37e…

MALICIOUS

PDF

68.6 KB Created: 2020-12-22 08:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8880a14c1d897dfa42098e7b1563d4f3 SHA-1: f8b35c102c5af550462af48f0348ff864562bc5c SHA-256: 91fe88000258b37eff0807f9cd56d6553acbc452fe3036796257e17df38fe6a9
154 Risk Score

Malware Insights

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

The file is a PDF containing a link to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the embedded URL is the primary indicator of compromise and suggests an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=free+thank+you+letter+template+for+students In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_5f9ea6618214a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_5fd945e91ac11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fd1d7fd85b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_5fd662307104c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f8fe9d984b4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdd3a8a51e6b539731b098d/t/5fdd92e1d85ca26442ee3f1b/1608356592070/olympus_camedia_master_2._5_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434b75f1-a7eb-4da9-a420-8b79eebb9977/10281809647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c5e72b-34fa-40de-825e-c46cac600354/literature_book_grade_10_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13c26445-a34c-4925-8e90-2f529665e930/je_suis_dans_la_joie_partition_gratu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704819f6-2c9f-417b-8db9-35c8278c1045/motors_for_makers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/74379518441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e013b43-ff6d-4f95-97c5-8ee05a19b240/19256908914.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_off0000ce18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 5400 bytes
SHA-256: d91e42848b703b74cd985ab81d30309425ee15f100ca4f26cc2c51f02207dac3
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 10992 bytes
SHA-256: 6b55d41c793c30631b890547dc4a6e976541e686f42187db47c754d2b2563410

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