Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e299b7f273a6fe…

MALICIOUS

PDF

75.9 KB Created: 2021-05-26 02:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6fa2f49bcd17fe0fc69b5722d98cc2ea SHA-1: 71c7aeffa06ab022b4f8f46416008d4180a6329a SHA-256: 66e299b7f273a6fe6068c4dd4cd3b080d12cf46f2b2416d771a9e0dd57ac856b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL being a redirector. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to accounting systems, suggesting a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=compare+and+contrast+manual+accounting+system+and+computerized+accounting+system PDF link annotation
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/vusone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_602ec8578a46d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_600df063a2545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fc849ab99f8e.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/5265834.pdfIn PDF document text
    • https://vusuvokitajize.weebly.com/uploads/1/3/0/8/130874031/3401115.pdfIn PDF document text
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/doludupura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_600c034c68e40.pdfIn PDF document text
    • https://kurenilomu.weebly.com/uploads/1/3/4/0/134042522/246201e4.pdfIn PDF document text
    • https://finepeva.weebly.com/uploads/1/3/5/3/135347337/xuvimeboxubivi.pdfIn PDF document text
    • https://wakepazatojux.weebly.com/uploads/1/3/0/8/130873951/duzipisaxi_zoderiwamefodo.pdfIn PDF document text
    • https://vemesefopega.weebly.com/uploads/1/3/4/6/134684253/nigazasexonikow-midobi-rizak.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/9994712.pdfIn PDF document text
    • https://xagajopudulu.weebly.com/uploads/1/3/4/6/134697977/4723807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/tabonudilun.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/introduction_to_stochastic_calculus_applied_to_finance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56ce978-03b8-48ca-964b-4af4157037f4/19795547989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4ca3c2-182a-4211-8403-618158cbe57c/chronicle_of_a_death_foretold_chapter_1_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ff36aa-6283-4403-a9e2-a355cca72c63/warren_buffett_investing_strategy_index_fund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1298953d-d422-41ff-880d-166d76422721/25583855301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ba269d-8472-4dbb-bf08-2fd7342f9485/how_to_find_someone_with_a_picture_on_google.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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 5452 bytes
SHA-256: fa5aa669f8191910b7a9c1c3a906c62248a4390984753cc1394f40c170102376
font_01_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 10096 bytes
SHA-256: 4be5095d46c71767de558096e0540b9d74f3275e1b5bbb5389c580933ce73a05