Malicious PDF — malware analysis report

Static analysis result for SHA-256 067ce3f692cf0f5d…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 07:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 063570c9f148a36ec35afda32c43a995 SHA-1: 8df50d92c7174aeae7850d714635c1abfb2562cf SHA-256: 067ce3f692cf0f5d5b6b124807324b206cd056aa1798074df00e44f9c9feb64d
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were directly extracted, the PDF structure and the sheer volume of outbound links suggest an attempt to direct users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cdn-cms.f-static.net/uploads/4454821/normal_602919ff51633.pdf In PDF document text
    • http://linavaluviriv.getenjoyment.net/ielts_reading_practise_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_6016d0a6e490c.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/will_it_be_safe_to_take_a_cruise_in_2021.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/boatbuilding_manual_fifth_edition.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/55486715329.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=night%20out%20outfits%202021PDF link annotation
    • https://s3.amazonaws.com/wuniku/anaerobic_fermentation.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/21960234831.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_c2710279b2d245a39e9a7fbd78ba19cc.pdf?index=trueIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_ccd3472e700748c8ae3150f66421f4b8.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_c4c20e906f6f4deeb55f76ea0f5dce69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6081e3-46ea-4bc8-8432-bd943032c695/the_surrender_experiment_google_books.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_5c2eb1cc57c14b5e94401db02110aaea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/897b646c-ba1b-46b8-8902-19954910cc74/swann_720p_security_system_manual.pdfIn PDF document text
    • https://e20cc215-f83b-4681-96af-be46f83cbbf7.filesusr.com/ugd/99b222_89b692ed02784b398e9984d3107634b5.pdf?index=trueIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/58138903460.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_a7d2a877d6264e508dcdad9707e3e17d.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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 4984 bytes
SHA-256: 0935357418898fe57f6545cf325100477fa6248c2e3adac60db9ed436ac31d5d
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 11712 bytes
SHA-256: 27fa3ff10c365d6afa4f0904a484bd12644261a5287851a959d5eccce0e36a12

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