Malicious PDF — malware analysis report

Static analysis result for SHA-256 659cad531dc57015…

MALICIOUS

PDF

85.2 KB Created: 2021-04-26 22:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 05f51c9111f93f34665bf5db62f3894d SHA-1: 367718474f9eddc9c4c9358d99b25cf4c7f402da SHA-256: 659cad531dc57015ef7d7a669764ea42c190429116097322baeaf83b2c1bbaaa
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=evening+primrose+oil+success+stories PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482405/normal_5fdb11d3c82fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_6028a81af2828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5fe4a3e0843c5.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/bfrjeif/busiswa_banomoya_remix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_604ab2a2ef311.pdfIn PDF document text
    • http://fitdieta.com/kelezibumc7lzn.pdfIn PDF document text
    • http://help-copyrighteamservice.com/130183682285bmof.pdfIn PDF document text
    • https://cdn.sqhk.co/xajapudoza/gdKwPgj/55054381825.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/3hdEjgU/for_you_tiktok_page.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/Q4idy9g/bomber_friends_level_290.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/jhO7Mgd/65502387484.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fc609a26b2f2.pdfIn PDF document text
    • http://crispyset.online/how_to_put_jbl_flip_3_in_pairing_modev0o34.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/c0haeyA/nevezetogazexumujokogu.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/AhaigPQ/nintendo_64_android_emulator_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_2ddab301c95540d3887e645a14daf80c.pdf?index=trueIn PDF document text
    • http://vovojoj.atwebpages.com/venn_diagram_sample_problems.pdfIn PDF document text
    • https://40052bae-d6b0-4be3-9c84-96956a804c69.filesusr.com/ugd/32907c_dfb885ac45e34839ad40caaf34e6088b.pdf?index=trueIn PDF document text
    • http://kadizilurojiniz.onlinewebshop.net/low_calorie_frozen_coffee_dunkin_donuts.pdfIn PDF document text
    • https://8cff2b46-3289-4d4c-b6d5-84761b4963bb.filesusr.com/ugd/c91274_87dcfed94faf4b0e918796f9daa0ca94.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_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 5060 bytes
SHA-256: b0bfe9857965f31071f51832d61d7576d565f8bb4397020ac99ca38dd8d6c1c0
font_01_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 10648 bytes
SHA-256: 80199b9d6e953ee0ef3c83d9614581db9a9f11efc67ad0f4e0ee961ab117d8d3

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