Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc5eb14dae24f46…

MALICIOUS

PDF

81.6 KB Created: 2021-04-02 10:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a30f019aee8069611f859e1eb64fd827 SHA-1: 94e6d8861087a7258be5279efa0761540360170a SHA-256: cbc5eb14dae24f4630a7e789a91b88f723d798005c3999ff8b6654d916523cde
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=ncaa+division+ii+basketball+scores PDF link annotation
    • https://cdn.sqhk.co/barugogip/1jhjfaw/225453499.pdfIn PDF document text
    • http://fallofelin.online/weduwijalififawunajef1nc7h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_6027216a865df.pdfIn PDF document text
    • https://cdn.sqhk.co/jevunazuru/afihgdW/advantages_of_effective_communication.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_5fe711e73bfa9.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/ighv5ij/78923690757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476140/normal_5ff685cde695a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6036043deca41.pdfIn PDF document text
    • http://carins.info/dutavodubuvuk2tv45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_6042c7bcd64c7.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/jchaieG/wivulirilawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_602e62c7432db.pdfIn PDF document text
    • http://secureappeal.com/how_much_do_wilderness_first_responders_makeehik9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460709/normal_5fcd7f3b7fbb3.pdfIn PDF document text
    • http://netewe5.xyz/le_bon_la_brute_et_le_mordecailiko9.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/XGiiwgq/detolozitumipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_6047e0c69452c.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/7b18abd9-1ee4-433f-b505-9af1b98d77e6/giwawuletesuriweluxoje.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_b565a6cded5b4cc89819518383060d97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a59fbf-49be-499c-bb7e-206866162091/frankford_arsenal_platinum_series_rotary_tumbler_lite_with_clear_viewing_window.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9d66ec-7311-4117-88f3-e155cc676620/57847563961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d64dabf-0163-43b1-a52f-1642f5a80922/29704490062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95fe9983-38f3-498a-81c4-ea8963c06ece/nowozajabakeretaxot.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_ecd181e9bded4fbf81e9c727be3797e2.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_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 5164 bytes
SHA-256: 28aab27d7e0667eeea550da833e0e223e294cac485ca7cf8d4b58ee84778804e
font_01_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 10908 bytes
SHA-256: 2e94b9da4cf11a137f0b9c79ffa1951c7d2a2e1d934a5f166ac185deb8415e81