Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe649dc468beaef…

MALICIOUS

PDF

102.6 KB Created: 2021-04-15 02:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 440b5198346be3f21a4564ff9e95c7fe SHA-1: c9227cd14b92579232cbf1cc6e7fd6b4f33c2bbc SHA-256: fbe649dc468beaef0fddce8466d200b0f408af4b704734907837c689085a282a
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector link to 'dafemum.ru'. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to drive traffic to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=does+tracfone+still+offer+double+minutes In PDF document text
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5fffe25c89bd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450430/normal_6008eee0a817b.pdfIn PDF document text
    • http://dixagodal.iblogger.org/what_is_literal_rule_of_interpretation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420019/normal_5fed44aac718c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_6017d0c0d2893.pdfIn PDF document text
    • http://mareson.getenjoyment.net/13159724530.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/98ce754b-56c4-4c09-afb0-f51bd5907049/is_seo_still_relevant.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_d7ed1c9f0e1d4b92804ae20afca7a89a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1af3ae4-9fce-4cad-a59b-232d2ad0170a/31155067396.pdfIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_ae21a39db5934875be025566b45b25d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd9f682-e70f-4637-8ed4-9ddda49b8819/87590003666.pdfIn PDF document text
    • http://gofusunoko.rf.gd/terip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed80334-d80f-4ede-9047-972899df312e/graphic_design_portfolio_or_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce7b964-7a03-4f4c-ab47-aa3a29759763/vidas_secas_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1e1c27-ca31-4ce9-8dc1-fb4b0d55b911/how_many_electrons_can_each_p_orbital_hold_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c027bdcb-d077-4dca-a507-4f608d63220f/majujilikakisovonupega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e03774-a66d-4e39-aa75-7bdc1945716a/how_to_use_powershot_pro_electric_stapler.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_f95cb194a8c34e139c206b7ab195c2fd.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_47553b6e490e4053b1f33bb703db32ec.pdf?index=trueIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_5b2b0bea71384c85b763af4a756358d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1b8b632-cfa6-4b9b-9e80-f6d2da116411/navy_blue_bomber_jacket_mens.pdfIn PDF document text
    • http://nomamazuzut.atwebpages.com/application_of_probability_distribution_in_real_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d94d5c-f9a9-4cea-b66b-22fd49691a43/plantronics_backbeat_fit_vs_2100.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13264 5304 bytes
SHA-256: 111d5628e1377bda43198061e5ac8df928e68c93583c8d95f949d83374fd3e62
font_01_sfnt_off0001445c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445C 13380 bytes
SHA-256: 6dfafcb4177890e40bed50418761b42de9acadfd1af29553a82d30a9b21b35ca
font_02_sfnt_off000170e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E8 18152 bytes
SHA-256: 8804805acd34c19e8d2ce6dca6452532da0a8f52176ed42223a1f3588dad5a2c