Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f522603e6587a7…

MALICIOUS

PDF

89.3 KB Created: 2021-05-18 06:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ead7bd3a80a0b9f4e3220839ec49f7f5 SHA-1: b3984746d6b9f81d74fce23ad1cc2b7e0a146b89 SHA-256: e7f522603e6587a7baca9171247d89abd4d47bf0d73894704aececbeb31fef0b
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and a machine learning classifier, and contains numerous links to external PDF files hosted on disposable domains. One critical heuristic indicates a link to known malicious redirector infrastructure. The file's structure suggests it is designed as a link farm, likely to distribute further malware or engage in phishing, rather than providing meaningful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=10.s%25C4%25B1n%25C4%25B1f+matematik+olas%25C4%25B1l%25C4%25B1k+konu+anlat%25C4%25B1m%25C4%25B1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_606853dd19384.pdfIn PDF document text
    • http://lozavisimas.22web.org/73608408414.pdfIn PDF document text
    • https://pedulexonevexo.weebly.com/uploads/1/3/0/7/130740508/famujebulijujep.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/232783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495395/normal_5ff71c734770e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_5fd11731a8de0.pdfIn PDF document text
    • http://zopevaxawoxe.22web.org/xorokegudulef.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/494d480.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/f7f5821555a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5fd05c16e1b05.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/molox.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/juzosimitiwizisanox.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/wolorunan_bigisevijulut_kejisanunagelol_veselek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5fdef8a589a8a.pdfIn PDF document text
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/051ebe63c.pdfIn PDF document text
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/9294832.pdfIn PDF document text
    • https://lakofureluv.weebly.com/uploads/1/3/4/6/134632848/netamon-vazize.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fca9a56141a9.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/xenuvogemar.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/268a499b5f5b05d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazusoketa.epizy.com/15198481147.pdfIn PDF document text
    • http://ronaripijamalon.epizy.com/36714718041.pdfIn PDF document text
    • http://xaxotuk.epizy.com/streamline_english_connections_workbook_b.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 4084 bytes
SHA-256: 2451451233ddf9865863b5be45f5d9a4db8fcab90e50da3b6ccd96119774db72
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 5044 bytes
SHA-256: 720828ea1bf861716e1128f02c9c84c96d08afa5ba9b7d587c2adac2edb56373
font_02_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 11136 bytes
SHA-256: efffc6355f59c11423634244c72547feee87d8e904128051e22091cd9c3af3d4
font_04_sfnt_off00013e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E25 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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