Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cd5fa173c9cc66…

MALICIOUS

PDF

85.3 KB Created: 2020-11-14 06:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fb52a54107dfe5187359ddff17e3bb7e SHA-1: 5f17d6810a1b9f2821f6a21c909aeb9075be7085 SHA-256: e0cd5fa173c9cc66b9ee58d89e9c3147e4fdb3875eb4715e9fcd0af7ed55198d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to medical guidelines. The presence of multiple external links, including one to a potentially malicious redirector, suggests an attempt to lead the user to a compromised or malicious site.

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://traffmen.ru/aws?utm_term=preeclampsia+nice+guidelines+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f8bf513b2fc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f9b8fd0bee7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5fa18cb4c19ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5fa911f58b708.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/b94bb.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/a417463b-e506-4686-ba3d-df9c836cab6d/zawofovudol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034038de-a681-40cf-9d7e-8ca42194197b/koxubexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a2f8e1-1a33-4c84-bc9e-66d6cae051b1/gopijobulewinekevarepibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4672dfbf-f8d0-4a9a-8c40-b599d29f9169/67294565324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c82d92-186d-42dd-960c-c6a57248b2f1/jilbere_de_paris_tourmaline_series_hair_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/367ecda7-0d57-4442-94b4-f0fd071a133d/82376814136.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_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 5476 bytes
SHA-256: a487b5de6a8447e2d129777c392f826a5374ff6549a5bd088ea823d0cbda9c46
font_01_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 10232 bytes
SHA-256: 25637aa89e0996dbe9aa78a305b8efd7612a84f7e46c0204562def7b40c5581a

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