Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bb20eafa4b2639…

MALICIOUS

PDF

73.7 KB Created: 2021-01-31 03:38:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 23c5ca1d116735db16804b961012f118 SHA-1: 6100e0c1e4c2177982fe5ba7fdee6d986b6049f9 SHA-256: 76bb20eafa4b26394a76b6f3eaac192ae3c98ea7803ab13fa0600cf6eb61244d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. While no scripts were extracted, the document's structure and embedded URLs are designed to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=app+store+mac+won%2527+t In PDF document text
    • http://mattelipsticks.site/jadadupjd98t.pdfIn PDF document text
    • http://gigurokubi.66ghz.com/zoripakoboxowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fd32df71e4c4.pdfIn PDF document text
    • https://cdn.sqhk.co/jujegopenop/5vDMPUj/athletic_clothing_wholesale.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/hdifPUn/download_chatous_mod_apk_unlimited_coins.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487192/normal_5ff4782a5e151.pdfIn PDF document text
    • https://cdn.sqhk.co/zawukomofise/jTVkuXA/kugulisifogupen.pdfIn PDF document text
    • http://rosovutuwonemis.iblogger.org/plague_inc_mega_brutal_guide_fungus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_600f10a82a947.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/hd8jejd/okta_verify_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/NhjBzgd/ark_survival_evolved_cheats_pc_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/bDEhbic/74056643975.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/jehbii4/16188228285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_600218cc74056.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/csT3jcp/53241246628.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
    • http://gevorewububew.epizy.com/gtd_todoist_setup_guide.pdfIn PDF document text
    • http://duxuramubot.epizy.com/data_matrix_2d_barcode_format.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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 4900 bytes
SHA-256: ab00dcb91246600d74d76c65410092152938ef8a0bc2348513a961dee66cc3c4
font_01_sfnt_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 10044 bytes
SHA-256: 05fc22a1b5a2a00eab238946e3eb17d771952e33d80e0f511b4ef8ba570eac95
font_02_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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