Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccee303dcd7d23a…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 16:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 31d65358fe32a66e0604276afcc55e1a SHA-1: 725ec0ea75e1aa09e0df2bb500dccba21cf0ca17 SHA-256: 7ccee303dcd7d23a39a7ab74cc0d292c3243e9ac4d644e1201bef83e4f04dd66
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that point to suspicious domains, suggesting a lure for users to download content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs and link farm characteristics further support this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://gimoguvi.ru/award?keyword=books+free+download+urdu+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476275/normal_5fd613753061d.pdfIn PDF document text
    • http://profoto22.ru/xeramokitudipimubisis4prmg.pdfIn PDF document text
    • http://zelopaqq.xyz/trust_and_estate_tax_return_guide_2019eduls.pdfIn PDF document text
    • https://wikumegi.weebly.com/uploads/1/3/1/4/131407968/kufegafunazu_muxawokazukuxe.pdfIn PDF document text
    • http://shoop-ft.ru/zedge_app_ringtonelznp6.pdfIn PDF document text
    • http://smartradiobf.ru/jikod7n78e.pdfIn PDF document text
    • http://agent-spv.space/536192160668y6o7.pdfIn PDF document text
    • http://naturfresh.fun/zelda_ocarina_of_time_sheet_music_piano0cexm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_601f1511f259d.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/wozesafugemnw8xm.pdfIn PDF document text
    • http://huseyincanx.com/pemetvqgl9.pdfIn PDF document text
    • https://moworanapubo.weebly.com/uploads/1/3/4/6/134685821/271aa294df1a904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_6023131b73a84.pdfIn PDF document text
    • http://creditchecktotal.info/bloons_tower_defence_6_guidepjrjd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/warapagefasovi/manualidades_para_nios_de_prekinder.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/vewuzesuxomomuw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 4996 bytes
SHA-256: 8fd83197a83e50f61755a7b2dea876f70eebbd46026f2fa35d81fcbc799b5bc8
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 11212 bytes
SHA-256: 302437ad674cec95284b1175162b6f75b8d379c6f6161ddfeb479f0e68e6108a
font_02_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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