Malicious PDF — malware analysis report

Static analysis result for SHA-256 f302339fff51707a…

MALICIOUS

PDF

75.6 KB Created: 2021-04-04 12:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 974d0dfc84a8b0f372891f83661061ad SHA-1: 7090632226d14a02522e61459d80616ef5743cc6 SHA-256: f302339fff51707ad600a673b52acd25efb994668fa4a24b2d3a455d232b35f4
96 Risk Score

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://resalured.ru/123?utm_term=apron+sewing+template PDF link annotation
    • http://pubavamamuzagur.iblogger.org/wesovilir.pdfIn PDF document text
    • https://kisisixixugejo.weebly.com/uploads/1/3/0/9/130969502/9086848.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/voxakezowenalemopamonegux.pdfIn PDF document text
    • https://nolenefin.weebly.com/uploads/1/3/4/6/134629259/2944890.pdfIn PDF document text
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/9400119.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/wuvepilamamuse/65078765895.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/begom.pdfIn PDF document text
    • http://riberudedanute.epizy.com/address_formal_letter.pdfIn PDF document text
    • http://tekubone.epizy.com/supexemotari.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_72da6a745d764a5d9afad3c34f25e38e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/68606093133.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_106443d7a30640758a1d8ff5a8a1a224.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_13b0a29b69e04efdb8eb62dbe05e7197.pdf?index=trueIn PDF document text
    • http://vabetatamuf.rf.gd/vector_algebra_problems_and_solutions_class_11.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_68c3b2a21dac40c095563a918e62b28c.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_98e01a2141b34cecb12fab94af3685ba.pdf?index=trueIn PDF document text
    • http://kutoduno.rf.gd/ost_diabolik_lovers_more_blood.pdfIn PDF document text
    • http://sidesapamapa.epizy.com/25236543650.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_44944e768b654ada839db37f4314779e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/72328112123.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_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 5220 bytes
SHA-256: a5e4e9e08c800d9add69e64cb1207baf61ceab7afbb2295fe6c8fcdb2eea5a1e
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 10976 bytes
SHA-256: 2df75d105adc201c6bcee6dc6c82f48ccf7d63b81fb73d5368eb2c653878fab0

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