Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e087919393ff599…

MALICIOUS

PDF

75.3 KB Created: 2021-02-05 10:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5382ce3b4924fa770fd1c0802045952b SHA-1: 53569c03b5e9b4005feaf43dd701400be8989c67 SHA-256: 3e087919393ff5999ddc187d0b116944cdb05c5417d7be3e9666910d5b7c09d4
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://baarspo.ru/aws?utm_term=picsart+apk+full+unlocked+2019', is likely intended to trick users into downloading malicious content by appearing as a search result for a popular application. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=picsart+apk+full+unlocked+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402737/normal_5fecc5622278d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5fef72c541886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500432/normal_5fec37699bb21.pdfIn PDF document text
    • https://demizuxikeb.weebly.com/uploads/1/3/4/0/134000208/tovulij.pdfIn PDF document text
    • http://supfitket.buzz/spotify_account_checkeroiowk.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/mugugi-gawilisalageziz-linizigivum-kedebeguvizokaf.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/39cf15664ba1c60.pdfIn PDF document text
    • http://1gusevshop.space/dead_cells_switch_update_nsppbqmg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403684/normal_5fe38f57514ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467915/normal_5ffbb359cb9fd.pdfIn PDF document text
    • http://easylearning.space/lil_wayne_leather_so_soft_mp3_downloq0yxr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_6013c57b84020.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/fejatepudopito/36290868089.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/lujoreraki.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/20974372866.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/application_cover_letter_template_latex.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/52952617531.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/lupus_nephritis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/678625964.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_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 5696 bytes
SHA-256: 81ef2795d0c1ce0ad97f59e75403afdc48c76ca2725f65af1f67c9ad0745f0bf
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10384 bytes
SHA-256: 23a8e0e50f9b63aa2b25e4663b7529df6b7c09fff7fadae802cf1d4b2da86050

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