Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c25cf1377609ff…

MALICIOUS

PDF

73.8 KB Created: 2021-03-20 02:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05998e8003b65f65b220d2dbd4174e24 SHA-1: 2215b03bbca27c9a5b2196187b899e9d69eeaf13 SHA-256: 27c25cf1377609ff04fef3983987903c2ca8ce1c8f43a02128eff4da0bfcbf77
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. The embedded URLs point to various disposable or suspicious domains, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/wix?keyword=boomers+fountain+valley+donation+request PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5ff51def42ad2.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/nuzufeluvut.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/8af7252de.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/bagegog.pdfIn PDF document text
    • http://idealslimitaly-official.site/how_to_repair_ryobi_battery_chargerbj0bo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_6034d281a783f.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/mopok-porepapivuna-vezoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_6011275b2c903.pdfIn PDF document text
    • http://zumbayuliya.online/lukesoe4ro8.pdfIn PDF document text
    • http://arbitestpark.xyz/85227636356pphc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421614/normal_5fe1171ccdd7d.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/bf7115dbbd9b26.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_66a1f9d3c0cc45a494811e61b0eaabe4.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_43124e0cc912484287ad7230b5040e4b.pdf?index=trueIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_68189c45fc39432caac6021ae998cfb1.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_e35b5baa2d4f47dc90eaf3e9a32fbbde.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_98de983847e84707833fac6ab3a4b364.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_e38204e6ffe74ff99db64d6d903328cc.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_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 5392 bytes
SHA-256: d01b8a9741ee038984f6205ef1a1af8abb312c328100b4b29e6a42910d84b99f
font_01_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 11252 bytes
SHA-256: 9b4b6f5839d2edf36145643153e685190932acacac18e7ba4437315a6a4f2b97

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