Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea02b648cb1acb26…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 23:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ed546ede9b8b8664f4522b04480482a9 SHA-1: 2575c9d0f1ec4870fffb20c3cdd3c2670af92c03 SHA-256: ea02b648cb1acb269a9615407d4d9f54fe66a1535c0163ea6d224937d2c20bbb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wix?keyword=macromolecule+review+worksheet PDF link annotation
    • http://zimipamus.22web.org/kasesaxasipuxixifuxir.pdfIn PDF document text
    • http://muvibigi.22web.org/zozokadorad.pdfIn PDF document text
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/99f5361a.pdfIn PDF document text
    • http://kosolamod.22web.org/90405105895.pdfIn PDF document text
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/sovirabog.pdfIn PDF document text
    • http://vojutivuzijan.22web.org/mundo_de_sofia_pelicula_resumen.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/jhQw9jf/40406864584.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/hiSKLic/77280849312.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/korafuro.pdfIn PDF document text
    • http://bilapak.66ghz.com/gotuvavalov.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/gfhjiyg/thrifty_shopper_ithaca.pdfIn PDF document text
    • http://rabatil.22web.org/fesudebofuxakow.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/cgjiiko/kifefobelakaj.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/d33d8785-87b0-4d63-9a58-4feb1c78caf9/56964265316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a139aa99-bf1e-4449-8156-cdea5cb05bd4/masterbuilt_electric_smoker_temperature_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948b46a9-433b-4d0b-b4ec-9da9c86d5d89/four_past_midnight_first_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb88a9fa-8ec5-45c0-a4d2-b0bb6e71bfd6/desaninivofobipogojewus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5ede4f-07cb-4624-8859-da95b9e6e390/good_interview_questions_to_ask_candidates_for_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d5f507-ea1e-4ee1-97e5-8596fa84874e/satebodalivuwimazopokuvaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f199f59-d5b3-41ba-ab29-eca6e1f80cc9/whats_the_menu_at_burger_king.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b06c8c-2f3a-44a1-82e3-0b858ba2a5b2/madeline_book_series_in_order.pdfIn PDF document text
    • http://wiwafejopof.epizy.com/ticket_template_png.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_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 5260 bytes
SHA-256: 0d6cea8d4a387843af20fbb032596ea2ba11bf96ce39c58f08ab939075863f4e
font_01_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 12680 bytes
SHA-256: 762777c565d64b99e4de76567fce7da5ea9993b4219943b54c9602722b6914ac