Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bfe8e95143390b…

MALICIOUS

PDF

81.5 KB Created: 2021-05-20 09:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d9f0303859e21617382d09ac026877c SHA-1: ce96cb6d99dd60eb5f4ef8758e6b2c4ea05d3559 SHA-256: e9bfe8e95143390be3db0db629d0878be4653e36fe7b9856bc0cdd28f1be83c1
136 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, with heuristics indicating it uses an image lure to redirect users to an SEO redirector. The primary malicious URL identified is https://soxebez.ru/strik?utm_term=vdates+the+physio+code, which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://soxebez.ru/strik?utm_term=vdates+the+physio+code PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379233/normal_5fcbbbf288470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5fd32cbb4aeb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366313/normal_5fcd39a12f1b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_60359e250f125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5ff4282d63536.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481418/normal_60058e12d42a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472503/normal_5ff13faf4056b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530171/normal_606ba34db36c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_605ef95ae9334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464303/normal_6041ef4898ee6.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/d3dc94ca-a543-4408-9ba9-c2f763187c4d/finding_angle_measures_of_a_right_or_isosceles_triangle_given_angles_with_variables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490f935c-03fa-4cfc-807a-af39289974ad/shark_id_smart_calling_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9374e9-53ec-43df-a617-6d3a6e3c119c/how_to_train_your_dragon_cast_dragon_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112e92c1-5749-42c4-86b8-afa9e795c51d/motajerilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7a6bf2-f36d-469c-8e29-36b5e50d7755/night_owl_camera_customer_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47cf88c-f2b0-45bb-89c1-51741ec382eb/roxidaresidemizale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b795dd7b-4adb-49c2-8188-d3a67008fbe4/what_is_universe_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f014e281-da97-4687-b672-230f50638936/befopuvajawij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f5aa7b-229d-403d-a1e1-04757af9623d/zodobujola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f528aab-13f9-4102-abb5-66590a8390d1/1914_tarzan_of_the_apes_book_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc35ccf-bb96-434d-89c3-23f8428c60a1/56222269327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a9bf0b-8682-45b9-b9d6-5933f4377d7b/walmart_grocery_store_rohnert_park_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/071210d5-326e-472d-bb84-9d6e556a95b0/autocad_free_trial_version_download_2009.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_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 5100 bytes
SHA-256: f250691e06a104a7578e32bfe80d8bab8f5bf45dd225582c73b80c925456e249
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 12552 bytes
SHA-256: 1c786a96123673eb6fdfe97d4d0640ba381896b338d28893fd038184f3ac6433