Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eac3b05a67b8cbe…

MALICIOUS

PDF

77.0 KB Created: 2021-06-01 10:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7db251da8ec25562e15badb4f414e9c SHA-1: e8418211a987332addcea4ce760716f422a3ec6d SHA-256: 3eac3b05a67b8cbefc8c48047b8322a694e1b53fa0607530c08e9970922f1b58
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to unrelated content, suggesting a link farm or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URL 'https://chcial.ru/pbw?utm_term=how+to+make+your+own+box+for+box+jumps' is likely part of this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/pbw?utm_term=how+to+make+your+own+box+for+box+jumps
    • https://static.s123-cdn-static.com/uploads/4463526/normal_5fe11e3dda2fa.pdf
    • https://cdn-cms.f-static.net/uploads/4385231/normal_606e07d4edada.pdf
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fce8a3e667c8.pdf
    • https://cdn-cms.f-static.net/uploads/4452865/normal_6010cb8ad2c9e.pdf
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5fe876504a933.pdf
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5fcf16007675d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4419198/normal_60b0f4d669892.pdf
    • https://cdn-cms.f-static.net/uploads/4446496/normal_601b6d7586148.pdf
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5fd8af6ecbea2.pdf
    • https://keroxoxelesiz.weebly.com/uploads/1/3/1/4/131452869/gemix-laruke-vunoxe.pdf
    • https://refunijuxi.weebly.com/uploads/1/3/4/7/134748157/7237223.pdf
    • https://cdn-cms.f-static.net/uploads/4383704/normal_603e3472cb30f.pdf
    • https://cdn-cms.f-static.net/uploads/4474999/normal_5fdb5a04c414e.pdf
    • https://static.s123-cdn-static.com/uploads/4466161/normal_5ffcc8db5afb0.pdf
    • https://bevarepovorumi.weebly.com/uploads/1/3/2/3/132303359/3081417.pdf
    • https://fezakuji.weebly.com/uploads/1/3/4/4/134490841/6208183.pdf
    • https://cdn-cms.f-static.net/uploads/4493227/normal_600b329394167.pdf
    • https://cdn-cms.f-static.net/uploads/4380522/normal_605f73ae2d3ac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/512cf7bb-fe19-494d-8e4f-e51bc47f7417/tupinil.pdf
    • https://uploads.strikinglycdn.com/files/aae56a2a-bdcc-4b32-b95f-7a0df44910a3/7044456375.pdf
    • https://uploads.strikinglycdn.com/files/0ccb8e1c-60b7-485c-bd9a-d7e12fe46b54/geometry_worksheet_congruent_triangles_3_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/01a1df9a-5109-46d3-95c2-2ae1d3602178/how_do_i_reset_my_kronos_password.pdf
    • https://uploads.strikinglycdn.com/files/64af12b5-b5c8-4489-8dfa-95e5d91a14d7/20434724347.pdf
    • https://uploads.strikinglycdn.com/files/f98895ae-4c97-44f0-b4f2-c22b9867ca47/gedakewisoripebinixa.pdf
    • https://uploads.strikinglycdn.com/files/d512beed-1433-4d37-a80d-197a33666d08/who_are_the_biggest_cloud_computing_companies.pdf
    • https://uploads.strikinglycdn.com/files/37e67fef-1d22-4a80-8f0c-e7be8e2fd6f1/82644256107.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed85.bin
aeec13440327c8d85be499bbe1707da03bbd032bd273b668c03d623131070d55
pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 5520 bytes
font_01_sfnt_off0001004a.bin
47fbd638f05ec469596c122c80b1b49a2b32c2ba1683001ff954d87a9bc44203
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 10400 bytes