Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c28784f180c7d3…

MALICIOUS

PDF

86.1 KB Created: 2021-03-24 05:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8e8673b72719d7f8a601a49e37b29083 SHA-1: 5760f9b747dd8b5e8b231d532dd75f0d31402818 SHA-256: 29c28784f180c7d307f4846961608087d866519464eed31a7bd69a808eeae6b1
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://leonvi.ru/wix?keyword=beneficial+mortgage+company+of+ohio PDF link annotation
    • https://kedaweva.weebly.com/uploads/1/3/4/8/134895813/lapuve.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/xejada.pdfIn PDF document text
    • https://rukururage.weebly.com/uploads/1/3/0/9/130968917/sekovolixifisuv.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/bigube_gilob_xusiwasaxepesez.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/sevotiwekalaxa.pdfIn PDF document text
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/taromew.pdfIn PDF document text
    • http://rimanugoxomage.22web.org/74773136141.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/tugewetodisiwetusi.pdfIn PDF document text
    • https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/2096212.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/770db7d6-3b4e-43f3-b8d6-6fc050a89a48/craftsman_evolv_15_amp_10_in._table_saw_28461_manual.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_5741266d59b442d5bb215fac280e02d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vajefam/tuvisurudiv.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_b7e1c310ebb848eaaf933e8d727f19f3.pdf?index=trueIn PDF document text
    • http://xidutukas.epizy.com/dirolazizojatavote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c37b4c-7283-4e6a-b3a0-3aa1da66ea2b/96317191873.pdfIn PDF document text
    • http://xorirefojexo.rf.gd/tinoparimuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/89297617978.pdfIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_d1e67ab0157a443f8829fc59f5302c12.pdf?index=trueIn PDF document text
    • http://bakalawakajade.epizy.com/medical_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/61496908311.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_91ff334881704a298c480f79a831e745.pdf?index=trueIn PDF document text
    • http://raredinufewota.epizy.com/36966546932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d34e45f-bbc2-4bea-92be-4f5676243013/difference_between_stihl_250_and_251_chainsaw.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/acute_appendicitis_case_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b93f780-19e8-4d3f-9a52-fbac2a08b6ed/66343815047.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/89005457926.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_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 5404 bytes
SHA-256: 1545e43a810324a163342feec9957c2291ffe42f2d15fd2b84d3ca520c0312e4
font_01_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 11628 bytes
SHA-256: b50a5390bb7bc5fe0f4a73ed14ab19a2aa50d718b50d42f5233c7e665e49a4dd