Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7f6811c93169f7…

MALICIOUS

PDF

99.2 KB Created: 2021-05-30 07:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4433fd79fbd109d419247c90fb5f2ff1 SHA-1: 2531546edabd849d95690ce010b3eb91f52676ec SHA-256: af7f6811c93169f73167453f6e599ded816ec60a1be28ec3cf087ff6a54e17f3
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to external websites, identified as a link farm. One of the primary links directs to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://yafferge.ru/123?utm_term=120+herblore+guide+rs3 In PDF document text
    • https://xifutasuwisesa.weebly.com/uploads/1/3/2/3/132302919/8083335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_5fd835aacecda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_6060f03b5d394.pdfIn PDF document text
    • https://fifeguku.weebly.com/uploads/1/3/4/7/134733895/7223602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_604040906103c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_600bd1f335890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_5fdb3106f1ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5ff64a6be4b0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_606685e483fc1.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/0b2111b7-4f30-4514-a047-7f215edf0c4e/zabepox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24de66ee-16a0-4153-9e56-a1f341d743f5/35963944271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c1205d1-4a84-4ce2-a4d1-2b0c048a7bf5/88126195602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f9f54d-82ea-4d3f-8f7e-1e4a01c9e233/artificial_intelligence_a_modern_approach_3rd_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9bfdad-36a6-44b3-9d8e-6e6b4cb17d1c/twilight_breaking_dawn_part_1_full_movie_in_hindi_hd_1080p_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59896ce-8f90-44ef-bc07-8f00543180c7/honda_eu2000i_companion_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e7869d-ad55-4a96-9763-f3011dbdc1e6/80992068045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a7cf78-2c20-4d03-8893-e347a026a8dc/resawefil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66c9f85-96dd-4c37-a5c3-7071f127f728/43442157355.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_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 5412 bytes
SHA-256: 2a5e2a1c90b975017c589a853a1d46b9d3e40f658d139f24398072a8d0f7ddb2
font_01_sfnt_off00015738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15738 11964 bytes
SHA-256: e05ba3e1c29a2ef77cc51f2faee5fbc7e7d0eb7c684ff43c7d7a0b0a112952c5

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