Malicious PDF — malware analysis report

Static analysis result for SHA-256 8722f459c5e490bd…

MALICIOUS

PDF

80.5 KB Created: 2021-05-20 01:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a27a46acc8594d7e111858d7c914daa3 SHA-1: 22b85d8ef546882f900dbba79bfb50ec0e01bc4c SHA-256: 8722f459c5e490bd684ca520fbe8109e79286471c7ab1a72850bcbc468f3c70b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, https://xajibur.ru/strik, appears to be a malicious domain used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xajibur.ru/strik?utm_term=what+are+the+hand+signs+for+water+dragon+jutsu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479715/normal_6003a6f9a4069.pdfIn PDF document text
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/5797597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_602775b19742f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_6056ad837abf3.pdfIn PDF document text
    • https://lajizifoposu.weebly.com/uploads/1/3/5/9/135958207/lirad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_605c6e235a8c2.pdfIn PDF document text
    • https://gofabede.weebly.com/uploads/1/3/1/4/131453232/vukimiwevu.pdfIn PDF document text
    • https://serogewuf.weebly.com/uploads/1/3/4/6/134615077/rubinefona_xetez_depem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5ffcc5ed23861.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/34865b91-ccb7-4af7-b191-70410fd3134d/data_science_bootcamp_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cafa7db-7ac4-4e7c-9903-8e0b89898a44/kexepawudimetitix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e50fd1d-2f42-4292-8202-52e85172605f/jebifajokuwut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f02adcd-18fa-4cf9-afd2-03de8c99ecd8/john_deere_tractor_mega_bloks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c7982d2-9b19-4623-8529-2f4b4fccf5f7/75333734815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee17bf6-d6aa-4914-bd27-b7791c4a0142/bimotakaforanapejutuvike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4293f47-77a5-4e62-ab78-47e0bf289155/77864907353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643ec825-c1f7-4863-8994-6353bec2d327/sabertooth_990fx_r2_0_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bec6a21-a422-4fdc-abbd-d1bca71cbe6f/66646176324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a59a116-270a-4696-ab14-c8cb42e7d483/design_as_art_bruno_munari_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c778dc-0c1f-428b-bce2-9d3d0a1e5c63/yo_amo_a_paquita_gallego_capitulo_138.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_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 5316 bytes
SHA-256: 5bf6faceed6fba9b4449a602bfe8ad794118a84ef582b8b24188535db43a4646
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 14864 bytes
SHA-256: 0a0b39b07b4971b6d23bb720343846ce10aa125476080362ade215d135e7619f

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