Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d17aa8021b04109…

MALICIOUS

PDF

63.4 KB Created: 2020-11-18 00:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1c30bbf815e46b7d2f88ff1c3938dd85 SHA-1: da0d755bcb4dac8bc6c672db02419ad8a06f20b6 SHA-256: 6d17aa8021b04109efdb73cc6f53341664aa562fbb474c59d4481bf50e40fcd8
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/2017611.pdf.
  • 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://cctraff.ru/strik?utm_term=dixit+cards.+pdf In PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/2017611.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/8d4787a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5f8f8cb695166.pdfIn PDF document text
    • https://rezukozivir.weebly.com/uploads/1/3/4/6/134631959/2180483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f993cc3373ed.pdfIn PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/4546769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fa332881ba2d.pdfIn PDF document text
    • https://lukafove.weebly.com/uploads/1/3/4/6/134655473/zigajowopelolafa.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/b3ce6034-9328-43ea-b0f1-867f88a0aa7f/witcher_3_prima_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297e5e25-447d-456e-bbf7-82478a8a90b7/trane_thermostat_th8320u1040_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5a874f-b0d4-43dd-9e2a-16a45eed1e08/dorum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1b200f-2640-4c30-b3e2-2a3ffdd3f8e8/37603752715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e838e4-dbf8-44ea-8e05-cb201c56a39c/fotewidilewilojirurola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d965b1c-2f72-4106-8e2f-6f6a3748de34/tobins_spirit_guide_ghostbusters_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ba06b7-d1b7-4202-a3c9-fb3974c35663/fubibetajoguzina.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_off0000bb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9F 5216 bytes
SHA-256: 74f734f0f951453594e5f8bb7f17ac81c8f869154a4a289bd8d749f0c1fe8a60
font_01_sfnt_off0000cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 10532 bytes
SHA-256: 8737887b4aa700b9226fa6ddfa89907ad86f66addd7cbc59935be7aa1e2853c8

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