Malicious PDF — malware analysis report

Static analysis result for SHA-256 2133d70a7bf35f6c…

MALICIOUS

PDF

43.0 KB Created: 2020-11-06 10:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecede1e2dfea223862a0fd193daa856c SHA-1: 2d5bf4479fb6efa1c8dac7cdc7fc322c6ad420cd SHA-256: 2133d70a7bf35f6cb95ea0104c0e77fe31f6456ca3cdfbcfe9c281a70fcbd101
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, 'https://traffnew.ru/123?keyword=camp+rock+cast+dana', is directly present in the document body. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous links suggests an attempt to manipulate search engine results or redirect users to potentially malicious sites.

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://traffnew.ru/123?keyword=camp+rock+cast+dana
    • https://zopigokarage.weebly.com/uploads/1/3/4/3/134346298/mudadul.pdf
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/wixapebapadaraki.pdf
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/tibujiwi_wodenoburax.pdf
    • https://kinimozudex.weebly.com/uploads/1/3/4/4/134498073/katikipupu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7c1af387-eca3-42df-b591-0b2066353860/floyd_county_schools_calendar_2019-20.pdf
    • https://uploads.strikinglycdn.com/files/0331bd23-6756-4986-9514-b84c396239d3/subakaleranagekoreguni.pdf
    • https://s3.amazonaws.com/gizonukorad/93335609042.pdf
    • https://cdn.shopify.com/s/files/1/0268/8077/0224/files/47797167005.pdf
    • https://s3.amazonaws.com/zamuriza/bartolinite_tratamento_antibitico.pdf
    • https://cdn.shopify.com/s/files/1/0503/7283/7550/files/xuneroviruwexagujuzemalo.pdf
    • https://uploads.strikinglycdn.com/files/0570e081-6f20-414e-8e95-d42623460b59/joduzapijopam.pdf
    • https://s3.amazonaws.com/henghuili-files2/pdf_to_excel_converter_i_love.pdf
    • https://s3.amazonaws.com/xovekolamoxe/gezivamiwatukizogajolemu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a24.bin
1cb6f519f5cf34b253b48243f5ab6a0df0a3e41478ee2c507564529db5ea4a25
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A24 5156 bytes
font_01_sfnt_off00007b92.bin
9939847b1d31ea7e1cc8ac749fe9d5b7f117b1b854f484677c05d020526905ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B92 10456 bytes