Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ba8d3e0b21a06f…

MALICIOUS

PDF

74.7 KB Created: 2021-01-06 13:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a0e9d2baf2b527d2eda9fb234dcf7393 SHA-1: 260ddc9d97857947a50f844b8c3ab32ff474d1ac SHA-256: a0ba8d3e0b21a06f9c8d84a62915660d3beeba913fd8102bfba0f7770b2744e0
174 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to a known malicious domain, indicating an attempt to lead the user to a compromised site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to serve a second-stage payload. Although no scripts were explicitly extracted, the PDF structure and malicious link are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=capitals+of+countries+in+world+pdf In PDF document text
    • https://xodalolekuxol.weebly.com/uploads/1/3/4/1/134108590/1852545.pdfIn PDF document text
    • https://sigokati.weebly.com/uploads/1/3/4/4/134488660/meruxufut-xujozaf.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/bdb542a6d217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5fccafaae5b5f.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/678672c3-1a29-47c0-b5b8-46b58db9e8a8/coaguchek_xs_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a0644b-8e74-4dba-b2e0-7304ff06c19f/how_to_split_a_clip_in_imovie.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/tusonupipigowisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a978b8e7-1e98-4fa2-9d2a-4a3b6ce0f096/jinokizajekozipozipasimut.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/32727829733.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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 5148 bytes
SHA-256: 992e5794cfd53c427f66ef3e168fcdc57080715b5ce2f05ddfcf04729b18a81e
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 11160 bytes
SHA-256: f9de84cac3623bd22143cf4364dab81499f772226db421ab4b707dfe950b6bf2

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