Malicious PDF — malware analysis report

Static analysis result for SHA-256 6088f53615611fe7…

MALICIOUS

PDF

85.4 KB Created: 2021-04-08 00:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8df56908f8b10c184503bde0ebbc79f5 SHA-1: 74c659e4772b145969d73deafdbe900f404528c7 SHA-256: 6088f53615611fe71bd13a887f0f2a140b7b941d5d91f4192e1628a1964e3008
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9991

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 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.
  • 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://jacksth.ru/123?utm_term=bangla+song+2019++mp4 PDF link annotation
    • https://nateguwab.weebly.com/uploads/1/3/1/4/131453796/0e80d3272.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/764c1e733.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/9047079.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/sopefopujiwibud.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/dijepo-gigoxazitenibov.pdfIn PDF document text
    • https://lupakekurusope.weebly.com/uploads/1/3/4/6/134652685/df8905b.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/63915299589.pdfIn PDF document text
    • http://labebatazavanoz.mygamesonline.org/77490493394.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/puseraxodofevolos.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/ledetu.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/verokibajebu.pdfIn PDF document text
    • http://demejizato.22web.org/coniferous_tree_identification_guide.pdfIn PDF document text
    • http://zijimesaxa.iblogger.org/independent_t_test_report_apa.pdfIn PDF document text
    • http://libutulidux.medianewsonline.com/53898211043.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://dagubumomoze.rf.gd/tizuvabavipisijitugoze.pdfIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_4cba6389dd654614a9e0e21d103eaea1.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_3e6766770b29462394508e5b430ced0a.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_9c407082878c4d35a5fd3ec9544f8238.pdf?index=trueIn PDF document text
    • http://wofaxetelojowow.rf.gd/autumn_leaves_piano_sheet_music_free.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/vernier_height_gauge_least_count.pdfIn PDF document text
    • http://gitizisas.rf.gd/bulk_density_download.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_095f5f0bc428495b9535175ed7e23293.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 5660 bytes
SHA-256: 1cccb924f486647dbb7209cefb001967e1a5f737176637bf46ceab6a058b8ffb
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 12288 bytes
SHA-256: 7b988e2bd8fe3465ef260f94b8cdcb7253f52e42e7837bc8000857a192808110
font_02_sfnt_off00011dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 17300 bytes
SHA-256: 8a624b02f4ff96a43279ac83d7ab18a41e3dfe285950aeb1be004a1f39ef599d
font_03_sfnt_off00013777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13777 3756 bytes
SHA-256: 991e121116346fed39575aba28e0ea17db4e918f76798e37249d245d363b05bc