Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df547898568259d…

MALICIOUS

PDF

73.1 KB Created: 2021-02-25 19:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 608ce92a7c7f7dd7b347159345fdfe30 SHA-1: 05f9142cd19a207c5b8c35d7189b80e0b5874961 SHA-256: 6df547898568259dff3d0673ada72cfb94221f691f4562aa9a4446592a405f45
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external PDF files, masquerading as search results for educational materials. One of the embedded URLs, 'https://yafferge.ru/123?utm_term=understanding+earth+7th+ed+pdf', is identified as a malicious redirector. The heuristic firings indicate a deliberate attempt to create a link farm, likely to distribute malware or conduct phishing attacks. No scripts were extracted, but the presence of malicious links is sufficient evidence of malicious intent.

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 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.
  • 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://yafferge.ru/123?utm_term=understanding+earth+7th+ed+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369522/normal_5fe3ea7b1d964.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5ff2582b55071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5ff566f14a636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6026e153f3c99.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/622729580284.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465136/normal_5fde685182406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499005/normal_5ff4dd2242e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_6014a2db99738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501367/normal_601f9077f28a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_5fe8dfcd32596.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5ff82859b57ae.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/b8bb146489a8cc5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satawakerexe.atwebpages.com/cuanto_es_150_gramos_de_leche_en_tazas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2D 5340 bytes
SHA-256: 7e27dc7593f12bcdf2d388361d2adef5cd617d38df4081ac3d7de1b700ca9d0a
font_01_sfnt_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 11176 bytes
SHA-256: 1bcf525bb7f471ccf89b85f66734bbe588bd539661f5889e47a2046f30e93fec
font_02_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16084 bytes
SHA-256: 6793135c9d5f2d9402216549edf66541f87ac1c2d7f717693568b2625ec966b3

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