Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bc5b281800d33f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-27 20:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c88d5a947e430ea3e551b701adfd8969 SHA-1: c8cab9b2cc4fba1628efee75402ab04c7c2cf1b7 SHA-256: 34bc5b281800d33fa31b4d9107280f98f2f2762443e5256de42d555941661f06
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic to distribute malware or phishing content. The primary malicious URL identified is https://pelibifir.ru/wix?keyword=pearson+algebra+1+common+core+textbook+pdf, which likely serves as a gateway to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=pearson+algebra+1+common+core+textbook+pdf PDF link annotation
    • https://sozezitevi.weebly.com/uploads/1/3/4/6/134639304/f03bcc18746.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/totavo.pdfIn PDF document text
    • https://safafiva.weebly.com/uploads/1/3/0/7/130739101/6484229.pdfIn PDF document text
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/7088141.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/563a5fe6a96.pdfIn PDF document text
    • https://tikiruwilowu.weebly.com/uploads/1/3/1/1/131163793/7104632.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/b73e43186e9ebc.pdfIn PDF document text
    • https://mojiwisixireze.weebly.com/uploads/1/3/4/6/134615440/sukeligopevimigeliwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://uploads.strikinglycdn.com/files/48912972-7b63-403d-9175-0d6757123ef5/puzojudulagegefuvoketari.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_75d118b52169452397772561a1d55349.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_886df6f779ef40549beabd58f84a911e.pdf?index=trueIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_a13a45e0718f440f8f2147c4b82018bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2155ae5e-07c8-4b54-9f99-d7f92446b510/how_to_convert_celsius_scale_to_fahrenheit.pdfIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_b1261a819ee344e9bb62d1044d15d1eb.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_8f342ac8c0784917891878b697c895dc.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_370e6d8de2aa4baaafade0148c875e36.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_43b40aa4173b4c9a9109b0eecccc3c7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07853ecc-fdad-4c94-bc2c-116d7458fa03/cazadores_de_sombras_pelicula_completa_en_espaol_latino_descargar.pdfIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_635ff3f226e84fec94c89e04d01bcdf9.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_d0b10f2dad8d49579e9e8c2ecd02eaa0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 5800 bytes
SHA-256: aa137e5b84b79c0e568cf9425cf650385be5456b56db5646985c454d354e9acd
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 11272 bytes
SHA-256: d7e0b4ebedfa0da831d9b030cb034ffc6e7c7a3fea2406f98d690eb5fee04492
font_02_sfnt_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 2072 bytes
SHA-256: a125880617f055dc94cbd2cd4c315700ebc997ec6103356a171f2de6018e5b7c

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