Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e46c3481bb87ebb…

MALICIOUS

PDF

45.4 KB Created: 2020-11-09 04:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 52c0209da814e871197b6a67409a9b0a SHA-1: b6bce1c4f0815bc2e16f8370dcae59da69ee4fdb SHA-256: 5e46c3481bb87ebb0d4f5477ee72ffd3802bdaedefe8ee012546145d6d9bffc0
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The document body, though partially corrupted, includes the URL 'https://traffine.ru/aws?keyword=pass+background+check+with+misdemeanor', which is also flagged as an external URI. The presence of multiple S3 bucket links and Weebly links suggests an attempt to create a link farm or distribute content through various platforms. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffine.ru/aws?keyword=pass+background+check+with+misdemeanor PDF link annotation
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/2850776.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/774977c.pdfIn PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/6038044.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bewoti.pdfIn PDF document text
    • https://terobatef.weebly.com/uploads/1/3/4/3/134397950/422fec23adf07e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zidenigad/characters_in_a_sound_of_thunder_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/kefesolutoninug.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/oberti_v_board_of_education_of_clementon.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/auditorium_design_standards_india.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/vascular_and_nonvascular_plants_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6417 5500 bytes
SHA-256: fe7364c5c6b39f48f0af8972b29471517ac20bc55cdd2d97df52e71c0523806e
font_01_sfnt_off000076a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76A4 10648 bytes
SHA-256: 4b1bb23766fbc62b25876e84d7114d25f50fbe359112d11bfe81d9f9a111581f
font_02_sfnt_off00009ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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