Malicious PDF — malware analysis report

Static analysis result for SHA-256 791ab688fe05bd5c…

MALICIOUS

PDF

47.5 KB Created: 2020-10-07 05:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4b2bc57fb38c2ba81a1a87fd91380da4 SHA-1: 4ed9357f0e3b074186163bab416d5dbc8ac2bc50 SHA-256: 791ab688fe05bd5c71b57f607bfba35b7e292d8bb588a54ce5a082eb7a6ed3a9
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://ggtraff.ru/pify?keyword=types+of+chemical+reactions+lab+worksheet+answers In PDF document text
    • http://files.krvbrugg.ch/uploads/1/3/1/3/131383283/04cf69d8de2a518.pdfIn PDF document text
    • http://latop.inspirationstudiosgallery.com/uploads/1/3/2/3/132303382/vajomaxelaroli-wiruzexex-gadirupat-siruferuzo.pdfIn PDF document text
    • http://files.ecconf.org/uploads/1/3/0/7/130739919/3397461.pdfIn PDF document text
    • http://files.julianhistoricalsociety.org/uploads/1/3/0/7/130776499/93e1daf512f.pdfIn PDF document text
    • http://xedit.centralladycatsoccer.com/uploads/1/3/0/9/130969744/tenejozud.pdfIn PDF document text
    • https://site-1039811.mozfiles.com/files/1039811/74237354212.pdfIn PDF document text
    • https://site-1036821.mozfiles.com/files/1036821/57892040831.pdfIn PDF document text
    • https://site-1039684.mozfiles.com/files/1039684/85491987937.pdfIn PDF document text
    • https://site-1039163.mozfiles.com/files/1039163/segepaxunewazureradijomo.pdfIn PDF document text
    • https://site-1040997.mozfiles.com/files/1040997/72859245148.pdfIn PDF document text
    • https://site-1040280.mozfiles.com/files/1040280/jadezetaxu.pdfIn PDF document text
    • https://site-1039131.mozfiles.com/files/1039131/zaxedidumamulu.pdfIn PDF document text
    • https://site-1038954.mozfiles.com/files/1038954/vifibebu.pdfIn PDF document text
    • https://site-1039355.mozfiles.com/files/1039355/45972831855.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/36809297545.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/vemifef.pdfIn PDF document text
    • https://site-1043607.mozfiles.com/files/1043607/2300273226.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/woribalaraporiwumuveza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000079f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F9 5600 bytes
SHA-256: bafbfd0124c9e817704802802c264881e7d8455fc08f96a2b3f50e856958fab7
font_01_sfnt_off00008cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF0 10280 bytes
SHA-256: c7f34c692366521be474ee8c9f6b0063791ae2176ab4949f0defc0276be7e48f

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