Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe00992b4c426c5…

MALICIOUS

PDF

78.2 KB Created: 2021-04-10 00:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e4770d95ea377e705b405954b77ae5af SHA-1: 875a7dd3d42a57e3e5386e71aba3fe22ed33d4bd SHA-256: 8fe00992b4c426c5f9471598b1f532d6277cefb0af5b2e76f260a73ab0ad8b47
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or redirectors, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not directly analyzed for specific actions, further supports the potential for malicious functionality within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+the+difference+between+brother+serger+1034dx+and+1034d In PDF document text
    • https://cdn.sqhk.co/ruzewekafan/giGhjYK/13562107633.pdfIn PDF document text
    • http://zimefob.22web.org/aditya_hrudayam_in_tamil_free_download.pdfIn PDF document text
    • http://dovulup.iblogger.org/wivevozosa.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/6905345.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/fonevebitida.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/dfda2cbff.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CvgiczF/ragaduwojak.pdfIn PDF document text
    • https://pazibeze.weebly.com/uploads/1/3/1/6/131636707/308301e9a.pdfIn PDF document text
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/2003749.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/7153374.pdfIn PDF document text
    • http://tixobedo.22web.org/kjv_life_application_study_bible_genuine_leather.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/Jmbqhfe/facebook_stock_price_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/cieEigI/6400203072.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/gasodamuza/paxum.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_2fcc6d4806e145ac92168d45cc4fece9.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_68e54bc1837640288c820674ba79e66a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/70255832834.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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 6008 bytes
SHA-256: 5b55fa57a322f26cbdffe5d1bf7842ac7013f3fbcf2dd6cbbd19ce57b5a9f05a
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 11300 bytes
SHA-256: 6c217e521edd3eb28907da3b43a9be80b021b7f2d0daa88b7772e3edb2c48afd

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