Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ba78409e362b18…

MALICIOUS

PDF

81.8 KB Created: 2021-01-06 00:24:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8e3b2668233d137a4cbd863e61a99879 SHA-1: d329e7f1df7d1fa35d2cd1c0b86077cd50a9de45 SHA-256: 67ba78409e362b18c551ba9c4a05c6bb49cdb229652290d8a0e6770ff83420dd
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, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to '1984 study guide questions and answers', suggesting a lure to entice users to click the malicious link. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=1984+study+guide+questions+and+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470552/normal_5fcb66807e25d.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/gdQWhja/residual_income_formula_accounting.pdfIn PDF document text
    • https://dozemobogojegum.weebly.com/uploads/1/3/4/7/134759036/3929071.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/3594778.pdfIn PDF document text
    • https://zugavugusalozi.weebly.com/uploads/1/3/0/7/130776271/7ece8647f0b344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5fa38b739b94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_5faa7cef1090e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5fc852e06aea8.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/dhi0gef/xamilurofurawepuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414864/normal_5fce0ad46e6a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8cabe2dad7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xasovewipeje/bipolar_1_disorder_dsm_5.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/anticonformiste_en_arabe.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/zapib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 5560 bytes
SHA-256: 0c2b6f5fa40b8b793ef947eef793bb0dbc570b3e010d6ad0dccddae33866c2d1
font_01_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 10252 bytes
SHA-256: 3c1ce2242a33936eb76d71636552c151dc2541f649db274ea42b119e64f4a047
font_02_sfnt_off00012bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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