Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7ab508e0b57e95…

MALICIOUS

PDF

74.3 KB Created: 2021-06-08 15:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 027a4bc651db7d907ed121083f1c1bd6 SHA-1: b0f553ee7f1dcf475ef046c297e085e693191a2c SHA-256: ef7ab508e0b57e95fa810525c3119f1695f4fd9419784505c7daebb0a253c8e3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/pbw?utm_term=how+to+code+a+game+scripts PDF link annotation
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/rametezononed-wofus.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/wazuwar-dudamumajaz-ruvenenotig-rawolupow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_5fe9ebcccc301.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/mifot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6068659909bf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_5feb864920ab8.pdfIn PDF document text
    • https://laxopewivizi.weebly.com/uploads/1/3/5/3/135394850/xumafuvikozaw_wufupuriverawov_wurosupigu_gelig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_60318512ea498.pdfIn PDF document text
    • https://vuloninufe.weebly.com/uploads/1/3/4/0/134012437/3202892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_606cededb7b89.pdfIn PDF document text
    • https://moluxoket.weebly.com/uploads/1/3/2/6/132682852/dozofo_kekin.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/fobatejosokuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jorowad.pbworks.com/w/file/fetch/144836859/why_wont_my_polaroid_tv_turn_on.pdfIn PDF document text
    • http://subazim.pbworks.com/f/jigabutemosomejozipoz.pdfIn PDF document text
    • http://wikitaxif.pbworks.com/w/file/fetch/144543783/how_to_make_a_resume_template_in_indesign.pdfIn PDF document text
    • http://supulilofib.pbworks.com/w/file/fetch/144828675/unable_to_terminate_process_windows_10.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144750447/teninexabipugekefiluru.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/ctv_halifax_reporters.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412662/54241097393.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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 5412 bytes
SHA-256: 31b89e93faa4951061218672c9cbb0ec0ef3c9f7203709e0e8af75a10687ece1
font_01_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 11508 bytes
SHA-256: 37a4bc6652f7e4e35916bf8380469153cb59d105f934fbbd844ac08bc46e4e27