Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b09b066e7ebb832…

MALICIOUS

PDF

75.0 KB Created: 2021-05-28 00:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 39866e1da289dff891bb97c4ebc4b80b SHA-1: 5e1c7dd7e53c8dcd11f5fede222a2166ff513018 SHA-256: 1b09b066e7ebb832971af9cfc522d69ab5a121d66e47aa588c6596537bbaee53
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, with one prominent link pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a popular mobile game.

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://jacksth.ru/strik?utm_term=how+to+play+call+of+duty+mobile+on+android+with+controller PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5fe7d2438c9a2.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/kiwebokilumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454300/normal_606a303ab9cf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5ffbac8bd8592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_605193ac48b5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365639/normal_5ff7e209a63b3.pdfIn PDF document text
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/fa4bc0b2fa7adf1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_60052e83f2134.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/774a5b6a-881d-47a8-af76-4683d29aca89/73405022285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79a3d406-f421-417a-a49f-cff7de8e29bc/why_is_my_electric_furnace_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b43a102-0520-4893-b7ad-8acf6aca5c12/16666713544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e733ea69-67a3-45fd-9587-a33f7d6a55b2/sidozobirewowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9efa3841-ff14-4f0c-93aa-a1fbb3b4c6b6/how_does_nutone_intercom_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2750b91-9d5d-4951-bdeb-2720875be47c/what_is_the_meaning_of_beaded_bracelets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefb89f6-e23b-459b-9dca-841430f5264c/cholo_juanito_y_richard_douglas_vol_3_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd749ae-2088-44be-8e86-24ab23a24004/napogomepoguratilixuledop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b1a65f-b080-417f-8808-173c8158534e/jodagijubasinizakesiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ecf27b-3c58-4ce6-bcd6-b99b9f7af35d/zaropojojil.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_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 5512 bytes
SHA-256: 9a3c86043cc31f8848c4ed987ab5de5e0b4eaf0143d694aa16d34980b20d63b9
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 10224 bytes
SHA-256: f53a546502a670dbd8fcd0c23b80e7ab8ce03f322090f4da3fb4554ac8c19029

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