Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1a2ff97465ea73…

MALICIOUS

PDF

82.1 KB Created: 2020-11-13 17:35:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9d9fd9591fddd9fb2dbe9cdf39469241 SHA-1: e68f31f865163f582b1976a11af7ff5337948b09 SHA-256: 5b1a2ff97465ea735bfd48cc8635773f03b4de87befd8b431d893e5c884cf9ef
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 flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded content, though heavily obfuscated, suggests a lure related to 'quest' or 'appraisal' to entice users to click on the malicious URL. The presence of numerous external links, including a link farm, further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=ddo+cannith+crafting+quest In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450355/normal_5f9e6dd6760a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_5fa0753b7bec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5fad6c2c962a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5fa1e73ad41a5.pdfIn PDF document text
    • https://luvikexixof.weebly.com/uploads/1/3/4/4/134481561/javarusejimunukakepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5f9c7b0662016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5f924c9f149a4.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/mesixadelomomo/performance_appraisal_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/27427631453.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/80623084581.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/gambar_bendera_merah_putih_gif.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/arsenic_and_old_lace_play.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/5332697639.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxibipan/torokep.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/zugodobonufag.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_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 5376 bytes
SHA-256: 89886e6ceaf87be4b909162e67aa2006fe90c46fbea245abec3fb8e345bbaf10
font_01_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 10608 bytes
SHA-256: 129a2872659afc561bb7b7d8c69310fd7e461f77f6b5d20d728e7abe0c3b6f28

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