Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b2530bd47fe9d9…

MALICIOUS

PDF

75.7 KB Created: 2021-03-23 02:18:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ca723b8fdd7e888542176b13c83b3ab0 SHA-1: a97bb56232e2bf04e301cb4a91322ff9df4b46b6 SHA-256: 43b2530bd47fe9d9e2c9ce087d3747482841a9b9a3af735bd0599b96da06c751
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 0.9996

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://pelibifir.ru/aws?utm_term=dyson+dc25+parts+ebay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458849/normal_6052d17ed14ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462362/normal_6007c5df3b50c.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/bNhjhix/life_after_death_book_in_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426260/normal_5ff2d55aa09f2.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/ghajggj/3153992989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_604aea2b3ade6.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/gfjamgX/apoptosis_necrosis.pdfIn PDF document text
    • https://cdn.sqhk.co/dokederajo/whdxXTi/vanulawitezijugekubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_60330291db227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_6039acc93d638.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/bibf3if/xosujugeref.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_72cd7b11c1e045c5a924795cda3548e9.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_5de9bae73e42444dbbbf0a996b0a2565.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/sample_itinerary_format_for_schengen_visa.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/starting_out_with_java_from_control_structures_through_data_structures_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/forever_stratovarius_sheet_music.pdfIn PDF document text
    • http://gofeneneju.rf.gd/java_tutorial_for_beginners.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_8fb97b97879940f8a4cbdbe3d680e912.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/limewub/word_survey_questionnaire_template.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/zudaxup.pdfIn PDF document text
    • http://pedorusare.epizy.com/14709807910.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_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 5532 bytes
SHA-256: 3969cfd112454cc3cb0f849befabcd04b14511633f26b3dc6e10c9292df1bb54
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 11496 bytes
SHA-256: c9ba7d632d3d3aea0c632768790c2b2f174ee2124586566db619e0e8ecde5393

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