Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55bdb8f47ee3caf…

MALICIOUS

PDF

68.6 KB Created: 2020-12-18 01:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4b47ebf95a0a4ace4bace38b200bd35b SHA-1: e90339203e64a59c3f3a6ce3e12649f4947b0bce SHA-256: c55bdb8f47ee3caf0c06bf8af6701063ea0ebaaab3b94a91613ce6a79f973119
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence score strongly suggest this document is designed to lead users to harmful sites, likely for phishing or malware delivery.

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://ggtraff.ru/aws?utm_term=bed+sheet+sizes+chart+in+meters In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376103/normal_5f8d61c8b00ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476567/normal_5fada5edb7572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460706/normal_5fb285c83a2e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5fa90235d1221.pdfIn PDF document text
    • https://rolawopu.weebly.com/uploads/1/3/4/3/134317168/5884961.pdfIn PDF document text
    • https://fevuleniwawe.weebly.com/uploads/1/3/4/4/134476097/908808.pdfIn PDF document text
    • https://newowuwaw.weebly.com/uploads/1/3/4/6/134634034/mogojewab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fc3e08ac7417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_5faf82dda55a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_5fbc291f375f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_5f8e1a1623e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_5fda32e651c0e.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/ba4ae2f7-da6d-4e75-b0ec-1bda4010ffe2/somarunelabozerogofedow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dfba7ac-0c5c-42bb-a89c-009c6efa0c8c/brighton_beach_memoirs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50737faa-9ab9-4959-ad41-280b7dabd94d/78746153448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756e0607-5ad2-42c5-a704-28aee3dbd702/liheap_application_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbe9bf0-3f89-4e4f-8496-3259f159eea2/fejolofamekulum.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_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 5248 bytes
SHA-256: 5881d0d76e93ae99adeb6f3e501f7b6dfbd43d23bfea8b9da619d0916f52e25e
font_01_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 10948 bytes
SHA-256: 4609e57d993819ec166cec3d755089b411e009c72022617df753a6862cf3868c

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