Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed6a4bc6f9b9f11…

MALICIOUS

PDF

75.1 KB Created: 2021-03-07 02:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4173a07048cab46ab836123f58774618 SHA-1: ba66eb3d7643d50f61931a4a3e70b5f0e080d56a SHA-256: 8ed6a4bc6f9b9f119edab3c39b4d6085bb2618906e79ce2337e23fb0c4fec23d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the structure suggest a phishing or SEO spam campaign designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/award?keyword=baby+girl+coats+0-3+months PDF link annotation
    • https://nazumuliwoj.weebly.com/uploads/1/3/1/3/131383416/1204834.pdfIn PDF document text
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/7719f13bc.pdfIn PDF document text
    • http://akvatehnika74.ru/56856455783clmmf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_60329e9285815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5fd7c77beb1c1.pdfIn PDF document text
    • http://qiwi-wallet.online/what_is_it_like_5_themes_of_geography1s25f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_600392a3672e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_602802db32113.pdfIn PDF document text
    • https://nudaduxovusupin.weebly.com/uploads/1/3/4/3/134337963/jasifizeso.pdfIn PDF document text
    • http://1xbet-regi.site/43852800765ulux5.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/puzedun_vikadinimukele_xukidaridixogo.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/ce2c271.pdfIn PDF document text
    • http://letxxnx.org/day_by_day_planner_template9s5c1.pdfIn PDF document text
    • http://chategratis.online/daewoo_nubira_1._6_16v_service_manualwpg45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471083/normal_60055d23b6441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_601a9ece950c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_56c366a681f543f282956ce8ac893d1c.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_a563f9a30fe64c2bbcd8f1563970a4b5.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_1a2a0945b6634fb5bd46fdddac666fbc.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_86c57533be924673bc110ee972ffbc3f.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_bff8527023644e349b54eaa88ba09bd3.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_b8451e3887494803aa8bb33be5ad7889.pdf?index=trueIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_981ced919a0747d895136f76a44a18ea.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_14be6b06712341578f68a689f1b377f4.pdf?index=trueIn 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_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5840 bytes
SHA-256: d96534b1a36191d7b5bebe62333e2d9d7b7bb9b9ad7cee48bbd266b4602348db
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10184 bytes
SHA-256: b92f51adc712f97277af802dc72740c93c8b5ab13bfd8835b8a850f6438341c6