Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff39be555a506b1f…

MALICIOUS

PDF

67.1 KB Created: 2020-11-09 17:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: e0595e3522c8cd9eba46ea6417fc6d50 SHA-1: a90c095aff35fc23648e140f0fe119d8f2e76672 SHA-256: ff39be555a506b1f732eec369e0db532a455a2604b7a896c5412cf34def960a6
254 Risk Score

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/strik?keyword=kutlass+bloody+scale+neverwinter+location In PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/vonokamita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_5f9ccc3ac3401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5f962dc18a082.pdfIn PDF document text
    • https://leninopuzidami.weebly.com/uploads/1/3/4/4/134493411/5116799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_5f8ef6d016448.pdfIn PDF document text
    • https://nawowelefet.weebly.com/uploads/1/3/4/4/134498780/mevizupu_tirubagadumedom_sifub.pdfIn PDF document text
    • https://jiwedizuku.weebly.com/uploads/1/3/4/3/134310564/fawupurejamol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_5fa056186bdd0.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/4891cf46-c138-48e3-97c5-ae029759d159/tusafufuzabepopegir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5109ff-be9e-4e9f-9ce1-f1b235aa863e/23045574753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18257a4-9e85-4ca8-9c3c-16741a596e4d/97185419645.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/3rd_grade_end_of_year_math_assessment_common_core.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f00425-2c04-44dc-aceb-71e56d2b8ebe/champion_4_toilet_flush_valve.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_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 5296 bytes
SHA-256: 95d8b4503b99372a14c368ddd1f5759d2add79f47d1cd38945aa8329d5106eaa
font_01_sfnt_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 10936 bytes
SHA-256: 7f9f091488a55a71b0975a6d2f22b3129c3a7fd53ba7980551af0439ba4212dc