Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cce67ed9bbec49…

MALICIOUS

PDF

65.8 KB Created: 2020-11-10 11:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6f2d6fde280a4a1e07c554550da8dfb5 SHA-1: 42b0d569d5d7684c960ebe8d6353376c4e6425c9 SHA-256: 04cce67ed9bbec499a42dd6e18e3e697617c2ea4363ee30f16a7cb172d19d6fd
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though obfuscated, suggests a lure related to '5th grade common core math assessment pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/wb?keyword=5th%20grade%20common%20core%20math%20assessment%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f87090ee2d79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f87df613d67e.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/6244178.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/lavuditu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5f8a1ca7659f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5f9eca9173d10.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/afc2a3e65c57624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f8e6d32ac9b6.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/lekizopiloref/tru_diamonds_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e5ca13-e229-45fe-98be-d192f7c9f2bd/34371733979.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/seventh_day_adventist_baptismal_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/43768830350.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/menuwifabebetanijiw.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/ascii_code_table_in.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_off0000c44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 5568 bytes
SHA-256: 219322f12c308eb056503eeb5260e843278d41386292deee1a8aeb2704af4277
font_01_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 10420 bytes
SHA-256: fdaf311d06015b8ee0a29780ab391bf1d865aa98c790409feacd9cc244e17f93

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