Malicious PDF — malware analysis report

Static analysis result for SHA-256 4749e4339c2c7912…

MALICIOUS

PDF

67.7 KB Created: 2020-12-20 15:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0cdf8c54131c562d27cf936b8e34c5dc SHA-1: b5db1263018a26b7eba31d29a735d821f7832c06 SHA-256: 4749e4339c2c791279dd8ca0224a264bb02c913f3a137b3d4ec59dab7426a9a6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on link farms, and one critical link directs to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body's obfuscated nature and the presence of embedded links suggest an attempt to redirect the user to malicious content.

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://gettraff.ru/strik?utm_term=medical+supply+depot+coupon In PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/13433fe.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/6883363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fbd434344ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5fb366c76e0d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_5f922a64e9b16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5fa24d62afec0.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/venewoligi-rafazasupaxu.pdfIn PDF document text
    • https://roneresikixa.weebly.com/uploads/1/3/4/4/134476702/756408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_5fa16f2fc0e98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc65ac32cf09257bd909f09/t/5fd1586e9a9e5443ac6b0a5d/1607555183918/84489233198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0947c80-82dd-44c2-91e5-08e3128b3387/14095982980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ded2a29-662d-430f-a555-edc2680b210f/vujukodifusifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d95fe871-52a0-4dfc-896a-8dac9b88a413/the_windchill_index_tells_you.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54c5f8787e8798988fe8a/t/5fcf86bf3fa051062b4ab85b/1607435973305/subway_run_princess_game_download.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_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 5076 bytes
SHA-256: 3cc2cd114bb6711e9a42aef712d8a7602f13e9f86efb22039a4b6b49b86210bb
font_01_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 10680 bytes
SHA-256: 528eab9747e0e1e7e60c1be8f1ddb633fa6d2423ce4a16e732528855878b0fdc

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