Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4cb13b648b4700…

MALICIOUS

PDF

69.8 KB Created: 2021-02-18 23:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 6a1d9cc95d8e3dd6d01d062589f4eaee SHA-1: d981804e5d26fc605a2bb65b6638891199f127a1 SHA-256: 3c4cb13b648b470048e74a781325bd6642e9bdf4511d378967390af29484d4f7
196 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
  • 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.
  • 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://jottigo.ru/wix?keyword=6+ways+to+informally+amend+the+constitution PDF link annotation
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/nuririgadiremir.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/868ef01.pdfIn PDF document text
    • https://vegebawijinewer.weebly.com/uploads/1/3/2/7/132740558/zurepodasapiraro.pdfIn PDF document text
    • https://cdn.sqhk.co/sarokuneti/5jeKxic/bounce_house_blower_cfm.pdfIn PDF document text
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/kunirikapipuveb.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/KgjJhaE/stack_surf_3d_model.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zubata/free_adblock_browser_apk_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/piketexosavajivam.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/android_google_sign_in_error_code_10.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/antioxidant_activity_of_medicinal_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/40216733836.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/63616234876.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/aerobia_y_anaerobia.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/29785350224.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/brain_meme_template_3.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_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 5512 bytes
SHA-256: c0941ecedb67483c68cac4729812eb029c0ce196347cac363293cce841fd2eda
font_01_sfnt_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 10492 bytes
SHA-256: f4b991363ace3bd90e24a831f8a52d713467e2d170b83b514ca4a61eb39dd2a1