Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ac2702228bd7b0…

MALICIOUS

PDF

77.6 KB Created: 2021-03-20 22:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 60ef04b9fdc6cf3cb158acbc8c611025 SHA-1: dc8329153cb2931506d2f41fc8d860b295489a2a SHA-256: 21ac2702228bd7b0063e735532dd10cc1991c0520d379100bcf6876aeb075cad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely redirecting to phishing or malware sites. The presence of external URIs and the overall detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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://vilenefex.ru/strik?utm_term=ab+doer+twist+instructions PDF link annotation
    • https://nafuvazufu.weebly.com/uploads/1/3/1/4/131407552/28a514d49d1.pdfIn PDF document text
    • http://italia-doc.space/50949837331xcij3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_60363a514ef4d.pdfIn PDF document text
    • http://yewes.space/diagnostico_por_imagen_pedrosarlhsd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_6017006515a31.pdfIn PDF document text
    • http://gratoramaa.space/rush_hour_2_full_movie_youtubepi57c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450337/normal_5fe05b1dcb538.pdfIn PDF document text
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/nixajalid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405430/normal_5ff2137c78a8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fed348bde1bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375203/normal_5fc99b565ca83.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/1dc9fb38f372da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376850/normal_5fed7f7b07430.pdfIn PDF document text
    • http://graatorama.fun/tetusewozafenerawojoziri6iwvg.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/pijodezun_befijagotonajuv.pdfIn PDF document text
    • https://pirusamu.weebly.com/uploads/1/3/1/3/131383726/mafivirusuwobaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413975/normal_6018546640299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_60414e3480bca.pdfIn PDF document text
    • https://womijepadake.weebly.com/uploads/1/3/4/4/134476187/ravisan-dokasud-lekeruriguzi.pdfIn PDF document text
    • http://flipping-car.online/what_prompted_european_exploration_and_colonizationp0zqx.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/1960890.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/f5352b13-94f7-4ca4-8578-5d097cca348e/reading_comprehension_worksheets_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3db42fa0-6611-4799-91b0-2cd56446b32d/misirivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fb56b6-0d2f-4987-9c09-45b11bd49028/best_yoga_books_for_beginners_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7f4938-6dd5-41d6-a3a2-1d932e8ac4cc/takinadotiwazalulopipomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a234e6c-67fc-4496-a3fb-bd8f619cd154/fataliporewabimugaxas.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_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 4912 bytes
SHA-256: 032c4a09fdfd17a360db3825acc27e38fd25f292004a6873a6744e74ab618dae
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 11400 bytes
SHA-256: 2af22267dcf2c3b453eb2b639f1bda17510c554041a2e7290b333b46e4deb9d4