Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae715c3028b55f72…

MALICIOUS

PDF

73.6 KB Created: 2021-02-25 23:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8b4220d2db160677ae1c25e36ef9a9f5 SHA-1: 2b4d0f2f4728ead4b8a3be471ddfee32dfe1c844 SHA-256: ae715c3028b55f72eea6fa759981dca8d45a9cef3ca9fbb260015b87c3e2a476
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=suunto+vyper+air+manuale+italiano PDF link annotation
    • http://xuxetosufuzo.getenjoyment.net/wafagegowewasapijifozam.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/2C9aWif/bodur.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/why_is_the_gnostic_theology_rejected.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/savofipemikujeraxajemoba.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/how_to_reset_beats_powerbeats_3.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/nibewedebasug.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/IWjfAgd/tegurewuluwu.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/linking_verbs_worksheet_for_grade_1.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/shark_ion_robot_vacuum_r75_with_wi-fi_rv750_reviews.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/56856651485.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/guzijuluxazojaxe.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/integral_of_csc2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_603778954abce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosigegu.onlinewebshop.net/duvatu.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/71413593312.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/zidetatitiwa.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/how_to_prepare_for_a_veterinary_interview.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/bowflex_pr1000_home_gym_cost.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 5052 bytes
SHA-256: 10a846808ceb2fb8874b0e681efdc6212a791f8f053b5e1d372b03ea5e7792da
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 10316 bytes
SHA-256: cf94d3eb5eaebfbb870f27583ed2b459ca045d4c0faf52fcccf566ce1ad5d911

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