Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac3328b6a37152a…

MALICIOUS

PDF

85.2 KB Created: 2021-04-07 22:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e3d87c966d2ad56f0eec74e71506f02 SHA-1: a14c46ba64a84ebb7b89a8adb16b587e36c0a0e3 SHA-256: 3ac3328b6a37152af670dd640ec21aee3d576bbe22fc47a164158e0f3e7b65f1
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/wix?keyword=section+33-1+chordate+evolution+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471971/normal_603284fae2535.pdfIn PDF document text
    • http://fakts.design/mupavapuv9vmv.pdfIn PDF document text
    • http://yewes.space/bafivubobexigugitazfix2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_606be40aed72b.pdfIn PDF document text
    • https://jajedasas.weebly.com/uploads/1/3/4/2/134234666/8322836.pdfIn PDF document text
    • http://onlinetyz.xyz/how_to_remove_paper_jam_from_hp_officejet_4630rtv4p.pdfIn PDF document text
    • http://trelon.fun/jakowee0sme.pdfIn PDF document text
    • http://brightshopbg.xyz/a_first_course_in_mathematical_analysis_somasundaram_downloadziuho.pdfIn PDF document text
    • http://walkover.me/2662530287497wub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411489/normal_5fcf5c6730b47.pdfIn PDF document text
    • http://hookup154.fun/riseturanolokepupafogib448l9.pdfIn PDF document text
    • http://magazinrf.xyz/is_dorian_grey_a_real_personlcomy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_5fd0df8293165.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/morib.pdfIn PDF document text
    • http://remont-pc.website/g_cord_wireless_headphonescwr7u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_601f63560dc05.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/xalexojaxipud/what_does_yes_sometimes_meaning_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/html_table_tags_with_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/83041831009.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/84159584829.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/sepsis_guideline_2017_sofa.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/5433923685.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_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 5696 bytes
SHA-256: 92e03cd07df2847525c1cc62faf8c8cf81c411ab393802383c91aa12c49e2934
font_01_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 10816 bytes
SHA-256: 453e57c81c522c514dabd9faf1bce41fa591a196c6e3eaa3cd8228ed0f6ec563

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