Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5384ffc4b00087c…

MALICIOUS

PDF

76.7 KB Created: 2021-04-04 19:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ebe5f4e34603840cb82d3298288d84ae SHA-1: 2670ee5320578aa3f007fdbc2810bf44e30aee76 SHA-256: a5384ffc4b00087c092d2a4b3a9bf5143095622410c5bc9b1c64f05eeb692610
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to a potential link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the presence of numerous URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest the document's purpose is to trick the user into navigating to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=aldous+huxley+the+art+of+seeing+abebooks PDF link annotation
    • http://mivakoxukike.22web.org/zakimusobadotenaxo.pdfIn PDF document text
    • http://guitar.su/sogajafujamifilupelefosx89tc.pdfIn PDF document text
    • http://funseeds.site/excel_bedingte_formatierung_datum_in_der_vergangenheitk0eop.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/SQUjdev/zenozulomu.pdfIn PDF document text
    • http://mugedly.xyz/nojarotobarowuofggd.pdfIn PDF document text
    • https://cdn.sqhk.co/gonibowijum/iarnjdC/tudoronapuwepabavexegazuk.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/bjgvlih/88361144661.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_ec556e4bfbfe440581d966854d2d6f9c.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_4117dfcbe1b34576af960585ada68ac8.pdf?index=trueIn PDF document text
    • http://gositagopa.rf.gd/venice_map_high_resolution.pdfIn PDF document text
    • https://165b0ab0-89c3-4517-b88f-e2bd0c55d975.filesusr.com/ugd/97b555_b79516385d6647b89a89c3957b8ea4c9.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_b9f95c6e440945b3b177f413ad610e81.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_6a634a5a214f4cc28d545d639eefb648.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_7d10fa01700a48ff9c99adf75938269b.pdf?index=trueIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_c1364af505dc45d0ace07e8e59c6c4ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/4131742326.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_77be6a03e1ab4c95b8d42dda35a167da.pdf?index=trueIn PDF document text
    • http://zarilapaserit.rf.gd/manualidades_navideos_con_material_reciclado.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/marvel_spider_man_ps4_free.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_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5532 bytes
SHA-256: 3117491618df0f90873e3e6ae43014371af86f58c7f353b97c5d91dca1646a87
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 11500 bytes
SHA-256: 3cd9dfa702d0dfdcada75f22b383b4417a293449ced0151618acf74d52b66843

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