Malicious PDF — malware analysis report

Static analysis result for SHA-256 641b7b05a31bb885…

MALICIOUS

PDF

47.2 KB Created: 2020-10-29 04:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b2b5d075aabaa947df289b93d6071353 SHA-1: dc82e0950b2b54e071d9b3a8cbce60fd0d7cf362 SHA-256: 641b7b05a31bb88525d721efd39e6209cdb732ea6b2e18b78c86a615e8f0a520
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/strik?keyword=data+mining+paper+presentation In PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/223128.pdfIn PDF document text
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/pagutikusarag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5f94db94eafab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5f949a5dc75a0.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/8767144.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/8788062.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/xikulidoxifoma-muxaf.pdfIn PDF document text
    • https://lumozilupive.weebly.com/uploads/1/3/4/3/134336046/rowusafenojo_bubutakawelis_soxaladufezoj_sijenubus.pdfIn PDF document text
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/6673331.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vunud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f930a17f2782.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/sanekufiwumafo/dupuxalanawesobaxoxivo.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/across_the_wide_dark_sea_comprehension_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9574/7488/files/naxugufirifobod.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/13548091788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7795234-b602-4bed-8f09-0ebdf87aeb44/stevenson_middle_school_bell_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97235151-bba0-40ce-8409-ca1eea00b57d/zafinuguv.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/difference_between_nationalism_and_patriotism.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/barron_s_toeic_6th_edition_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/2750/2508/files/review_of_literature_in_research_methodology.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_off000063b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B2 5108 bytes
SHA-256: 0a119f936d2e79fe2790778e56cb8d58c0a00726cc07e065e87f730591a07370
font_01_sfnt_off00007503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7503 10992 bytes
SHA-256: b393b1a740b99d3f81ca537a7b0eba7cf0715b112825a56bcc5f676d236cb9b8
font_02_sfnt_off00009a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1A 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8

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