Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef39763e7500643…

MALICIOUS

PDF

78.6 KB Created: 2021-04-23 10:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1e59aad2a5e6b5da6ae436c39f60717b SHA-1: 956e3a2d92e9b952d981577788b252e6347a71f9 SHA-256: bef39763e7500643a4998cc9cbd9544c6ea1ce97408c0bc7d9b68f9dee05e1b4
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, likely due to its deceptive link structure and potential for phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=star+trek+discovery+season+3+episode+release+schedule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_606041f431c2a.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/99bd375e20c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5fff78b5d9d78.pdfIn PDF document text
    • http://iceteas.space/uscis_forms_i-_130a2g8yx.pdfIn PDF document text
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/janirawowupefar-navoraniwufe-lirazoxugonu-wasawuta.pdfIn PDF document text
    • https://litusavetedi.weebly.com/uploads/1/3/4/4/134445261/4290918.pdfIn PDF document text
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/menitunefegir.pdfIn PDF document text
    • http://ing-cliente.com/tascam_dr_100_mkiii_revieweulx1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mozabufapimil.epizy.com/art_history_podcasts_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5fc1a8-83be-456c-a56e-d15608ffc953/nys_dmv_school_bus_road_test.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_fab5a59eb00741eb8c05a9213ef8e5e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72187e53-63fc-4b4e-b44c-36bfcd443049/how_do_i_change_the_color_on_my_p_touch_label_maker.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_4dd0e69e5201415d8693e3981f8ce694.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_3ed82eabc8ed4c82b8388e88407f71e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d24b87e-cea1-4f5e-af36-2399231cb466/beats_by_dr_dre_solo_hd_cable.pdfIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_e01150be24c14c8980c40699f80537fb.pdf?index=trueIn PDF document text
    • http://lobivovakebala.epizy.com/toyota_corolla_2009_engine_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a46684-6c43-4562-9ca0-3b303c01d47e/godaddy_wordpress_hosting_free_ssl.pdfIn PDF document text
    • http://joxisuzu.rf.gd/bab_iv_akreditasi_puskesmas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 5656 bytes
SHA-256: 0121a0da79ce1c6fdb319fa35dd221bffdf1ee5c964f39cbb0b2cd733462b559
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 11100 bytes
SHA-256: 325469471f678e2a3deb9b0e9a6bfdfb910993b336457e32db6ac17571b4a280