Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbd42f5314467bf…

MALICIOUS

PDF

65.9 KB Created: 2020-11-11 11:05:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236e73493bd4602518daa7b4141acf09 SHA-1: 12f13467af4385e908480c4261807776fd1f8ad4 SHA-256: 2cbd42f5314467bf1377231698a8037039a574ecb419125aa43774910c47be37
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, suggests a lure related to 'Romeo and Juliet' quizlet answers, likely to entice users to click the malicious link. The presence of numerous external PDF links also indicates a link farm strategy, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?keyword=romeo+and+juliet+answers+quizlet
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5f9316c9aace2.pdf
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f97cb1f65a25.pdf
    • https://wovuposekase.weebly.com/uploads/1/3/4/6/134613379/maxivoxe-vepododagi-dafidev.pdf
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f8841d640a67.pdf
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/2d03cccaaa4.pdf
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f87702f3db52.pdf
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5f92ccc7920a0.pdf
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5f9d1d02b7639.pdf
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/najebepo.pdf
    • https://cdn-cms.f-static.net/uploads/4421462/normal_5f9cfed0e2d93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8a975367-40aa-40fe-a3f9-d942911e0293/billy_in_the_bowl.pdf
    • https://uploads.strikinglycdn.com/files/d8aac590-69d4-4a6e-a1ba-11ceac0d73c5/33787017042.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c640.bin
e1508d92b9db780e923bf7d5a62e466c14cd13944db86bb989932f20c5eef786
pdf-font-stream PDF embedded font (sfnt) at offset 0xC640 5324 bytes
font_01_sfnt_off0000d85d.bin
768522a2cbaa5ea08fb6154fc755ee20173c33b31905ab917f32cbab9e49d81b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 10332 bytes