Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9b023c3174e193…

MALICIOUS

PDF

75.9 KB Created: 2021-06-09 18:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a6d0a25280f99fc1f95f7a1d64f7f3d2 SHA-1: 5150b1027f1340bf44cea6a34958b871e9d2d3b6 SHA-256: 5f9b023c3174e1935374535784e3a66c0c1e1f5ed3b226c2708140ec6c523adc
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The document body, though partially corrupted, suggests a lure related to 'Nationalism in India by Rabindranath Tagore' to disguise the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://coretry.ru/pbw?utm_term=nationalism+in+india+by+rabindranath+tagore+analysis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fc602080aee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_6046a8ec8fef2.pdfIn PDF document text
    • https://wevoforu.weebly.com/uploads/1/3/4/5/134591306/wojewes_duvubukibagowe_mofifow_xowisobumate.pdfIn PDF document text
    • https://xokejajolaliz.weebly.com/uploads/1/3/4/7/134718337/f5fed975b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_604707bf27a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_6048a6a511a22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483591/normal_60b8a77854ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fda215b614f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fdede03eecb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_605d1287b1d57.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/99c90928-94d6-492d-8650-67aa1b54407c/riwegalesowuv.pdfIn PDF document text
    • http://zogekinovag.pbworks.com/f/48454416107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be708313-427e-46c6-822b-81ba23485be4/wiruranizom.pdfIn PDF document text
    • http://ditidema.pbworks.com/w/file/fetch/144905688/komik_rakudai_kishi_no_cavalry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba58e5d-bda7-4aca-9bb4-4d55b1409373/perspectiva_cnica_dibujo_tcnico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27b9160-16dc-4e1a-a638-188fae3d78b8/zikufofexib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998ffaa5-31f0-4857-bdfa-98c818524251/upsc_prelims_2018_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e8b928-8908-4c45-acbf-fd930796229e/samsung_galaxy_s9_bootloader_unlock.pdfIn PDF document text
    • http://zawepiko.pbworks.com/w/file/fetch/144599877/is_bane_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625c2444-06a8-4b2c-94ce-db8b1743c21a/netgear_wnr2000v2_dd-wrt.pdfIn PDF document text
    • http://nugewus.pbworks.com/w/file/fetch/144524325/18789846816.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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 5452 bytes
SHA-256: fd66293be7810cd55a7a6cdf9bbfb72beddf6eace8831e8e12bbfd888dd45802
font_01_sfnt_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 10996 bytes
SHA-256: a6f103103898d8a535c6ed81e97be38ab13ea43faa8fdbf76716fa9c96ed38fd