Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef431b9bccef7de…

MALICIOUS

PDF

70.6 KB Created: 2020-11-18 11:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d78e8af8183148753813817c66676d84 SHA-1: 9b2ffb43552d705b64c43531fd97906a1651880c SHA-256: 4ef431b9bccef7dee218d66a315a5253d105bf14f92489ab8f67e475f24950d3
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=golf+wrist+hinge In PDF document text
    • https://mavegisokelu.weebly.com/uploads/1/3/4/1/134131346/zonegeza.pdfIn PDF document text
    • https://ginufadep.weebly.com/uploads/1/3/4/6/134668932/nigozaxatabig.pdfIn PDF document text
    • https://sinisedowinixa.weebly.com/uploads/1/3/4/6/134679082/lufeniti-valobaneso-vimep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/febopa/delutusanivinafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b974b49e-5d97-409f-8793-c421c6b5d920/73553203059.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/wind_energy_crossword_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0499015a-af3c-48f6-adca-efc448bfff50/31308145065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eedf729e-5d7f-46ba-9d6c-2311528eef4b/minitab_17_product_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/nosufajesimuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec1855a-1fd6-4293-9701-8959a6e0b72e/42145576595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21993bc2-f276-4801-a4f0-45c29c53871d/inter_tel_ecx_1000_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/medina_county_jail_medina_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf4add6-38a5-48bd-b08a-347533e2f411/lekejukaliw.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/18734006157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de014600-e6a2-4c58-8fa7-9853b87d059a/gazonunumozasivovowudi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 4728 bytes
SHA-256: 2d26c345e051525a3e3d8ef4aa1ffed472654722886a3c4d45aa3529b49955b6
font_01_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 9992 bytes
SHA-256: c15cca4547c56994a482c94e27ed7dfaff55c2fbb046d9d4e8ddb0d601a48368
font_02_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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