Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd12138ff72c16e…

MALICIOUS

PDF

80.8 KB Created: 2021-05-10 18:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69ed57438fafff5acf623845f5ea4b2a SHA-1: 9f673f8ab0a0602a3f933d94a52a1df6538b5885 SHA-256: 9bd12138ff72c16e0f4eeff12fb3498fe342e07ef2f1e8723d294a0e9440ce2d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=what+are+the+types+of+feature+story
    • https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/7245232.pdf
    • http://derifupiwa.mypressonline.com/crisc_study_material_free_download.pdf
    • https://nejaxadutoxukax.weebly.com/uploads/1/3/4/6/134622523/5258762.pdf
    • http://kemamibuke.mygamesonline.org/lobexamarife.pdf
    • https://sipigatijuk.weebly.com/uploads/1/3/3/9/133999294/zuvepizozakoni.pdf
    • http://xapidomin.mywebcommunity.org/lejigedetatobaridonakaki.pdf
    • http://movawizaxaxato.mywebcommunity.org/apc_550va_line_interactive_ups_surge.pdf
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/6048688.pdf
    • https://gizibufunete.weebly.com/uploads/1/3/4/4/134492386/4913965.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2d66045e-c276-4037-81df-184b25840e97.filesusr.com/ugd/cdf3e3_de62db00826b424abe2d91a3accd6331.pdf?index=true
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_fc01c1b65f4243929c8c43b31579a9f9.pdf?index=true
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_187b4b5664ae40f79eeae9ffc841e6b3.pdf?index=true
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_9b046c1026784f66828721476cba4513.pdf?index=true
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_58ec5b1b3e084e9ba3c7822a818bad61.pdf?index=true
    • http://zesafemumibow.myartsonline.com/lysistrata_francais.pdf
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_7eebe0866bb74b09bad4bd705b1bada0.pdf?index=true
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_1e54d42124cb44b68847f0076a063348.pdf?index=true
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_7106fc9f4889453eb809ac39e6283809.pdf?index=true
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_111c904f17524f589b4f1e64438e2825.pdf?index=true
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_9e7cf79e42df42f4a7ec7f36aae87944.pdf?index=true
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_438780ee6a984d479607a1986c1a12ee.pdf?index=true
    • http://sesoxevanadike.epizy.com/wokexirewopegiza.pdf
    • http://vurisadazuxe.epizy.com/pogiponisamupalelava.pdf
    • http://bokakemipik.epizy.com/appointment_letter_format_in_word_doc.pdf
    • https://49f3a523-2ddb-4f17-a073-729d67a362fa.filesusr.com/ugd/18c683_e5799aca52ca476e9b4e202dc6c3edb8.pdf?index=true
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_4dfe767c05a541f99df932d371cff5c5.pdf?index=true
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_0aed1e10c2054558a8d04737e3c4eec5.pdf?index=true
    • 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_off0000fbed.bin
f06712beeb1ee539cf5d6056dd25a264b3f008a4d2652e8a1e93877b3132c96c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 5072 bytes
font_01_sfnt_off00010d3f.bin
5d84c0e3c1bb63b5e74629ddc0592941de48a8f090232f722e57785e406b8dd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 11408 bytes

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