Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f20c773c685918…

MALICIOUS

PDF

77.5 KB Created: 2021-03-21 09:27:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b30620d7b8da3bde65d58bb117b0436a SHA-1: 1e2df9aff6511ab45d2c3cf0cb0c074e6261cb4b SHA-256: 55f20c773c685918c5e321f8c4741176d69766c42d4ad59b2f2743e8c3c41edf
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to a 'Ketogenic diet meal plan pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=ketogenic+diet+meal+plan+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_60559a4024b20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fe07726535ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_60501eb2abbde.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/fibiwisi.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/angular_contact_ball_bearing_skf.pdfIn PDF document text
    • http://quickstore.pro/hallelujah_piano_sheet_beginner7222l.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/map_of_the_world_with_countries.pdfIn PDF document text
    • http://ledozikatiresev.scienceontheweb.net/88749332612.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/create_business_card_template_ms_word6mgup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_6014c45f8a9ed.pdfIn PDF document text
    • http://midesamipazizuj.scienceontheweb.net/towexavipokafil.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/4940887e-b0dc-4403-8c6b-1a00b9b861dd/top_law_firms_in_new_jersey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510aad9d-fed8-4321-8297-8d8c5e156f4f/the_mysterious_benedict_society_series_book_1.pdfIn PDF document text
    • http://malejubu.myartsonline.com/libro_el_almohadn_de_plumas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56bca2b1-1dd8-448f-b045-568a03f143e7/57014497446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58194be-ed7c-4754-ab7f-88b71b0ed8eb/9565365729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7e630b-11c0-44d8-8937-e3a97a0c36da/zomotaremerupemaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67847c82-03a0-4a85-a9e4-90c936e292fe/biblical_evidence_of_apostolic_succession.pdfIn PDF document text
    • http://nibemodida.myartsonline.com/4936406126.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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 5172 bytes
SHA-256: 9079b6adfc30fb626e7b4cb8f0f7ca6f7448cab682d9fc0237661ac53e3959b2
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10936 bytes
SHA-256: 541a9908c005ca404060a507e30539ea805c71a78a6e7bd61c28e8b38b107c71