Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c1c953940d097a…

MALICIOUS

PDF

79.7 KB Created: 2021-03-26 13:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deaefbcbb6d01209341c48f9ad51eb9a SHA-1: 32762dd1e6b99d23a5211c93227b037d5584d105 SHA-256: d6c1c953940d097ac4deb07d43b923f6a13d5538c8377596a9b51e85b019ee98
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one pointing to a URL that appears to be part of a link farm designed to generate SEO traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=garden+manor+nursery+school
    • https://cdn.sqhk.co/xepiriza/hg0hfib/kesuwuvemepakoraloposa.pdf
    • https://cdn-cms.f-static.net/uploads/4490917/normal_6058b504d4076.pdf
    • http://good-production17.site/billing_address_information_en_espaolplwjp.pdf
    • http://firstflirts.site/fervent_by_priscilla_shirer_study_guide3fe3n.pdf
    • https://cdn-cms.f-static.net/uploads/4410678/normal_602dacbc889fd.pdf
    • https://cdn.sqhk.co/remimuroku/ahhhbjb/telugu_janapada_geethalu_audio_songs.pdf
    • https://static.s123-cdn-static.com/uploads/4389804/normal_5ffba0ef26b42.pdf
    • https://cdn.sqhk.co/notenirikev/YyYhcyX/27802270440.pdf
    • http://intereriia.com/13085393831g5gvg.pdf
    • https://cdn.sqhk.co/dolitife/fjbhaic/40616428805.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/01e208bb-f35f-41a6-9686-acf92345f456/proficy_machine_edition_software_free_download.pdf
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_b72ee6a2616944f0812103bdfe41a1a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/147928bb-c967-4dca-b7d2-5ea8ba28a419/nidokunananepodogosegokij.pdf
    • https://uploads.strikinglycdn.com/files/08abbe4d-cac8-4d84-8a47-f776bba23e45/how_to_install_hp_deskjet_printer_without_cd.pdf
    • https://uploads.strikinglycdn.com/files/e14a8c0b-af5b-4363-9f23-fe804eced507/gerutobavigig.pdf
    • https://uploads.strikinglycdn.com/files/f44e4ab8-5cfe-42f5-b9d2-a4188035c3d8/computed_tomography_for_technologists_a_comprehensive_text_2nd_edition.pdf
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_6c6a6e479f704ef29ea8e08b1830fb68.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8c5ff4c-3341-4ae5-9ef2-60613b1637c9/bontrager_node_2.1.pdf
    • https://uploads.strikinglycdn.com/files/4a2c7520-52c8-433c-a8ed-d57b89b5e748/87737548507.pdf
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_c9bc626c421b46a2ae077455f96c361b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/26e9e830-d487-40f9-aabd-699fe351811c/ravebizovan.pdf
    • https://uploads.strikinglycdn.com/files/c6379db4-56a0-46dd-8ea7-0d80fe52fc78/who_sings_simba_songs_in_the_lion_king.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ed.bin
dbefdf933e784dd1fbc81922cb0f73e1228486b57c3e0cacae7ddefae300350c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 5312 bytes
font_01_sfnt_off00010bd9.bin
b69daaab94f879b2223cc439721f5ef3876c26d10a2e5c6bf0868e46e6cc7ce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 10992 bytes

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