Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fddbdd3ec4a2917…

MALICIOUS

PDF

74.5 KB Created: 2021-03-08 06:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 000e43c55759ae8ea72357956c610ff8 SHA-1: ac9c52af50513f1b1a7a78dc6ffc5bd1ba3d3841 SHA-256: 3fddbdd3ec4a2917c1c1840f8078798377bfe5761ee9b9b46bbf7eb2fdb0ae0f
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains and Weebly subdomains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/wix?keyword=label+body+parts+worksheet PDF link annotation
    • http://floradoma.net/4997015306072alj.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/kelaterivofug.pdfIn PDF document text
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/fepepotu.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/wuwamokikufit-maxop-lasakesaju.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/27f94971.pdfIn PDF document text
    • http://balifruit.com/aeon_flux_full_movie_300mbeg3ui.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/9137696.pdfIn PDF document text
    • https://tozadifoxu.weebly.com/uploads/1/3/4/9/134904498/003ce5adca58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496360/normal_5fd87709ad4f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_601029c39048e.pdfIn PDF document text
    • https://pudibapajupi.weebly.com/uploads/1/3/3/9/133986481/1898707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_6005f233deb49.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/8162717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fd1787436345.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/kuvugakebamepa_lefewuxew.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/free_online_t-_shirt_order_formslc247.pdfIn PDF document text
    • http://itdiscount.pro/raxasqrei8.pdfIn PDF document text
    • https://fozabezadako.weebly.com/uploads/1/3/4/6/134639332/2400662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fe8becdbf00a.pdfIn PDF document text
    • http://priz24.site/89469612160pji8a.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/fupanabivote/brush_effect_photoshop_cs3.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/noxinapizobematuvofev.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/apps-_script_articles_expense_report_approval.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/magederelowoz.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/sivanefux.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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 5020 bytes
SHA-256: 78f599e69080931b7f3aca44bfc83b362f8bd2596c23483364acf3c1f4675668
font_01_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 10384 bytes
SHA-256: ad550feed3981f5da2a76db7d10752e94d32017759086462cc8380da43a8961f
font_02_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378