Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dc4a89a5d42643…

MALICIOUS

PDF

70.8 KB Created: 2021-03-26 16:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 26bc3da53e8c525a86a838a954c4a1ae SHA-1: 0867fbe1b5ca4ade0940caec9638f1a497d0dd47 SHA-256: c4dc4a89a5d426430a13494aa9e4ff4d48d92cf92498ba5e2d832353f08c2e56
184 Risk Score

Malware Insights

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

The PDF contains embedded links directing to known malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the document's structure and embedded URLs suggest it's designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=raynor+garage+door+opener+remote+programming In PDF document text
    • http://juwaniwabi.medianewsonline.com/oxigenoterapia_neonatal.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/temozar.pdfIn PDF document text
    • http://vegunax.getenjoyment.net/today_thina_thanthi_news_paper_tamil_download.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/do_not_fear_in_the_bible_365.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/what_is_atomic_theory.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/dojikidewutosizovit.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/zibokifojozixevosexu.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/2407e3fe-16e3-4e1a-9358-2683addb46ec/difil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7020c77-aa7e-4156-a217-92730fe44922/what_are_the_best_air_fryer_cookbooks.pdfIn PDF document text
    • http://jinugiwi.atwebpages.com/51809796012.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/varicela_tratamiento.pdfIn PDF document text
    • http://pulawev.epizy.com/letter_of_resignation_template_word_2007.pdfIn PDF document text
    • http://segudufarus.epizy.com/andhra_pradesh_state_formation_date.pdfIn PDF document text
    • http://tanonarimunal.myartsonline.com/automobile_industry_in_pakistan.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/is_fl_studio_fruity_edition_worth_it.pdfIn PDF document text
    • http://pelubameta.epizy.com/adobe_creative_cloud_error_code_201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f16afb-6df1-47e6-aa89-f717325113e7/ribijamebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d1e517-9641-45b1-8b2f-8ff553c22c0d/how_to_shut_off_sprinklers_for_winter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a72266b-934d-4aa1-aa74-3a0cd1691c2f/dalufumexubevujorebamuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b20f973-1735-45cc-a228-29bc67f1d57b/bojilevawudeno.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/fukazebekijanokafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3990de-206d-46ad-a058-ca230a6b264e/iso_31000_what_is_risk.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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 5176 bytes
SHA-256: dc21dc4373fbfe65ddc4e5b87f2410d6f532e75ff3ed9fa262cea76e35a4bf86
font_01_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 10148 bytes
SHA-256: 1f5c17b408a73d264d1fc2a377e8172cc344ef664738e5fc4fda800bb0461b29