Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc779f1cedb478b…

MALICIOUS

PDF

85.3 KB Created: 2021-03-21 07:19:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fdb8fcb721a8e33849147fcee4953615 SHA-1: 116da44687fe99eb85afcdeecb0bf9e24f9a2164 SHA-256: 5fc779f1cedb478beae777dc55dd0cde83daafc956e3a8d4b61ce792b2265e1e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://dafemum.ru/award?keyword=bienestar+animal+cerdos+pdf PDF link annotation
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/6941939.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/NtifLgh/jobs_matching_worksheet.pdfIn PDF document text
    • https://nuxozabu.weebly.com/uploads/1/3/1/8/131871912/359fe4a.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/Niggih9/sumo_robot_ev3_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/divabasom/hhBqjj3/jorijedupoju.pdfIn PDF document text
    • https://xevefoworux.weebly.com/uploads/1/3/1/3/131380592/8041302.pdfIn PDF document text
    • http://popenufavox.iblogger.org/chemical_bonding_best_notes.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/8fd59825-de18-4aa6-b334-a5d8598ce4c9/66692916010.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/microelectronic_circuits_solutions.pdfIn PDF document text
    • http://vilobeve.rf.gd/how_to_say_taco_truck_in_spanish.pdfIn PDF document text
    • http://sakunesazodi.epizy.com/types_of_gears_used_in_sliding_mesh_gearbox.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/49716975095.pdfIn PDF document text
    • http://jumezezufa.rf.gd/10304642860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d84d19d-f754-47b9-b846-a1f61ae27c9d/86551444877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e4ee4c-7861-426d-9db4-3b8c3d4c33b4/xorugudisexakopa.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/ayyappan_songs_starmusiq.pdfIn PDF document text
    • http://jenesigafepi.epizy.com/lapoxubudisisazogusowola.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/ccleaner_professional_plus_bagas31.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_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 5348 bytes
SHA-256: 379ad919e694b22a5ee22638a771d80d166ff4f1b5e6488cc9c2d359e4478318
font_01_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 11856 bytes
SHA-256: 5bf0e2820e139e7aaa13d52c079756d29e9ba1fbe06812c535030cd7023d043c

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