Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3e6a7982faaedd…

MALICIOUS

PDF

89.6 KB Created: 2021-03-18 22:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 647b76cc2ff61129214774b550d745ec SHA-1: 231a7a581c360caf2954d5fe114d914ef80ab625 SHA-256: 7b3e6a7982faaedd9ad3fdb3ce22c5bd66f7356b6bd06ac32f2113a8e1f1b073
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=how+to+get+pet+rock+adopt+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424953/normal_5fdc6c2004091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_6027ecc15fe55.pdfIn PDF document text
    • http://xozivupanivos.22web.org/bob_ong_books.pdfIn PDF document text
    • http://xodowomasugis.iblogger.org/dancing_queen_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_60395ec5521fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_6025b23735ed8.pdfIn PDF document text
    • https://fegejakir.weebly.com/uploads/1/3/5/2/135299458/dikakelumasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5ff7cba26a28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_602303ca22799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475580/normal_60017fa4be601.pdfIn PDF document text
    • https://nikonewakudofu.weebly.com/uploads/1/3/2/3/132303001/188b836bfb41bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/411dbe95-c4a0-40a2-85f8-27d395f53b60/2825313100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013e56ee-38c5-4a2a-8eaf-bc74a1d0ebef/naxonewujed.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_4ae1d23f92c74ab3910187473c0f89cd.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_dcc5cdc7c14847d2b57dc8ea9301d5f4.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_c4c4efb65e4a46798b6082d1cd5c46e2.pdf?index=trueIn PDF document text
    • http://menaronutex.epizy.com/bijad.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 5300 bytes
SHA-256: 8d8af075aa15cf924806cfa5a89bc80168d404694db8b34cdb2cac986cbd634f
font_02_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 2248 bytes
SHA-256: 2ccd3e1c2f4fe2249981aa432c0443180eadb49f8e402ebed1c42cfd51cfadd0
font_03_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 11460 bytes
SHA-256: 811f27809b444c552159eb5b1febbc0710ecc60b5333cae9c0d73e3f4b295806
font_04_sfnt_off000141a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A7 17176 bytes
SHA-256: 4d79e977bbc674ff9b268a30a1325b9c58d3627f5b3d6289056ecdc1b669ce05