Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9d3a6ceed74e42…

MALICIOUS

PDF

77.2 KB Created: 2021-03-19 20:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f5a79ba3ef3f9d6896569e65145a8b8f SHA-1: bff48a260fd3ed917c571337dcd707b4159943a5 SHA-256: 7a9d3a6ceed74e42de34d5e73b6ea7badd6896da849b019012f53bf34ef7ce9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or trojanized document. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://midufefew.ru/award?keyword=catholic+apologetics+books+pdf PDF link annotation
    • http://jedomagisuw.getenjoyment.net/zuvirebokuwizu.pdfIn PDF document text
    • https://cdn.sqhk.co/saxuxaka/6sRNteM/fodojowi.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/1142759.pdfIn PDF document text
    • https://cdn.sqhk.co/jadidawa/ggLCDgf/atlanticomnium_sa_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/jbgeSgv/13734825933.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/dZJGshc/91038638828.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/jjjcbPm/don_t_starve_shipwrecked_no_gold.pdfIn PDF document text
    • https://zurudepovog.weebly.com/uploads/1/3/1/4/131438860/2394894.pdfIn PDF document text
    • http://zurujavurobe.scienceontheweb.net/89385830500.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/7887e952-44c9-4603-90b7-66d22f04f161/10076845735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45eb20ef-ba29-4053-a111-1f4acb0734e6/repakedamuzoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb7c379-61df-40f4-b4b4-d4f3f6c6792b/what_are_the_advantages_of_energy_resources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f0ecbb-c065-45a4-9fac-5d0e5870e1dd/wujuzezenewetup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c28626a-7276-4ebd-8ebc-d16f17e1fcdc/dejak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422e7ed2-fc17-4767-b8d6-e8849069d052/reriresiwilezonopi.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/muvikudegelotebizifotin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72391b63-7488-4ca2-813b-d772e5fe3fd3/twilight_1_full_movie_download_in_hindi_dubbed_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807fa27c-561a-4291-b33f-f8faa9343cc9/how_to_adjust_the_hands_g_shock_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8403cbd1-6d52-42c1-8d0e-69ad552617ee/62433075640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c91d40-5ffe-4077-a774-8fdec552a9eb/vovibogajowogakipanikozop.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_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 5432 bytes
SHA-256: c028dcc22c1a086405424924196745151417195102fff63276c5b3e4ba503d44
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10992 bytes
SHA-256: 0608d053b497b660b2aaa22a4ecfce8cdbbe44c573ce03b178eed8743917f781

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