Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c99852a31c265d…

MALICIOUS

PDF

75.1 KB Created: 2021-05-16 07:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 43e0672341a31a4a4360a4c95a2a14a1 SHA-1: 913b38d8c871fea855744a68eebbcfc276cf7e7b SHA-256: 99c99852a31c265df4c179f1bdd549b4d83a64034a1a2c07b5439f985f7de41c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a link farm. The primary malicious URL is 'https://resalured.ru/strik?utm_term=the+prosperity+secrets+of+the+ages+pdf', which is part of a suspected SEO manipulation scheme or a lure to malicious content. The presence of numerous links on disposable hosting further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=the+prosperity+secrets+of+the+ages+pdf PDF link annotation
    • http://kabomodom.iblogger.org/gusurolefike.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/XRhhjhX/derupegojevebux.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/ghdtwgh/nuclear_weapon_definition.pdfIn PDF document text
    • http://numupizor.22web.org/xuperojuto.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/barifa.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/positive_affirmations_for_success_and_wealth.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/U54hfFG/angry_neighbor_apk_free_download.pdfIn PDF document text
    • http://birapemotafew.mygamesonline.org/blood_group_o_negative_diet_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xanawuvogi.epizy.com/ruwarazu.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_e5b8c315b6b7438989f151473a857264.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_286697dcbf9e4bc58132b3b1bc7e0ec0.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_deaecaf5d1854b8ba0fe9529d0d39060.pdf?index=trueIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_375af66343934b3c94be3be1adf4a0a7.pdf?index=trueIn PDF document text
    • http://siximinifiji.rf.gd/asites_usu.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_6750e809eb0341c8b6a0f3aa2229d1f2.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_446f1d591ded4833b1dc2e71add47642.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_3d7eb3d9d1f34b3b99579b774ffd7edd.pdf?index=trueIn PDF document text
    • http://mevumum.epizy.com/kimamokupamuginelosasira.pdfIn PDF document text
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_696b516bd88542ada472274fdc43b152.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_cb63f47551d0494981d6e31100f18972.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_77a31574bb694cedbfd9f8cb6de6d380.pdf?index=trueIn 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_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 5436 bytes
SHA-256: 188537548c85a0de34624b73665aea8bab2cbd043fa9b159f601cfed3ce9a9f8
font_01_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 11732 bytes
SHA-256: 3676b1b86a1de839b60dbee52176872fdf47f141953836f54de3d39f03f97c71