Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf31ab5e8529c92…

MALICIOUS

PDF

78.6 KB Created: 2021-05-25 17:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9f4fe6a0cef14aab08e5be6412b64b53 SHA-1: 4a55a8f88e2d98c0e7c9808791c69f935df06525 SHA-256: dbf31ab5e8529c925d013f2bdcbd89ea80abd205409c710ea7303156ca8495aa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+make+clue+game+harder PDF link annotation
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/0d6ff449f680ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426944/normal_5ff5df99990d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_6011009a68139.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/8f8aef1619f370.pdfIn PDF document text
    • https://saritubix.weebly.com/uploads/1/3/4/5/134507132/modiruzub_bipixisazuk_kegol.pdfIn PDF document text
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/182f3c808be5fe7.pdfIn PDF document text
    • https://rowevopa.weebly.com/uploads/1/3/1/8/131872281/nafom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_6066b8ed4ed3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_6029f08be644b.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/620844e14de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_603190c28645b.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/6f75bbca-615a-4afd-b0cf-129a3216087b/how_to_add_table_design_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb963c33-227c-4c0e-b575-c120e52fb160/los_juegos_del_hambre_1_peliculas_completas_en_espaol_latino.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/46796872019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13619a10-897e-4234-8dfa-18a1bf54f0ff/raja_ki_aayegi_baraat_full_movie_watch_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/xamizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98502e16-7914-4876-a03b-f91b85bea314/ponofewasenuxolidasaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39373e4-8326-4413-b079-dfe31fe3d2c2/guxugovutiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee66830-f1a8-476b-8c9f-18ec63351c11/tasomowubirijipukarugudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43da10f0-c1ee-4d8e-af91-8b631a9cf9af/57412926470.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_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 5292 bytes
SHA-256: 118d2635240846725e38a83d2de5678a16c64f3d4aa742f17e9a3a7557a8ab25
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 11096 bytes
SHA-256: e5fbccd4f502a070b46b236447856a4d942e3d669fcbe08d5d59101cc9bd23ca

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