Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa0a8a0e49d888d…

MALICIOUS

PDF

70.4 KB Created: 2020-12-02 17:31:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c605382be5ab8a12bdfdd54f0cde4166 SHA-1: b4b12b4f3ec4e191e45ef9bb00d3666da7c5df03 SHA-256: 4fa0a8a0e49d888d338c5d9ed9197261304d0d98b2ff9816be537fa78175c46d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or SEO spam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/aws?utm_term=free+pascal++win32+xp In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412908/normal_5fa1f52d8f011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_5fa6b27a529c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5fc2a87773037.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/burug-juxen-retigigada-morup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5faee7364a64c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_5fa7cf45b4158.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/fatotaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5fa0761d3d8cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475375/normal_5fa7371d13c24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_5fbff66f1ab3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fb831c2a6214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392650/normal_5fc629637aed5.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
    • 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_off0000c7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C3 4936 bytes
SHA-256: 49c85c5632945f923982442ce0bd2c28126d364d2455a523b935eee8709022fe
font_01_sfnt_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 11160 bytes
SHA-256: fcb55863c9c9c6841a4c2b72e4520931bde0fac10ef1a12c7dea7af710d1bd4e
font_02_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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