Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ddd6497f31d239…

MALICIOUS

PDF

79.4 KB Created: 2020-11-25 12:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5eb0913c3c153cf560ecaac2d8cc3ff7 SHA-1: dfb4bee5398d5f2752f7a2cf7051f9669583c73f SHA-256: 25ddd6497f31d239c0968c25b952133a1f7c4ef48072202cbfbda32f200b111f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the document is designed to lead users to malicious sites, likely for phishing or scam purposes. No scripts were extracted, but the presence of numerous links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=enduring+understandings+social+studies In PDF document text
    • https://rilebowiteb.weebly.com/uploads/1/3/3/9/133986594/20cce21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f8c2a2a94b3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_5fab34dbd029c.pdfIn PDF document text
    • https://tovoginimu.weebly.com/uploads/1/3/4/3/134379987/vibaxe-menozizopok-nebajowela-wetutevexumirax.pdfIn PDF document text
    • https://nizegefubazada.weebly.com/uploads/1/3/4/8/134872151/ditesewufi.pdfIn PDF document text
    • https://femimujuzo.weebly.com/uploads/1/3/4/6/134640298/b8e2dfa13efe.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/85978e79-535b-4ade-b39b-532a7759e212/simesujovijurevatakus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1ec417-abf0-47f0-8b08-26e0fbeffd46/78117534438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7687018c-c35a-4174-b3ba-7aa6edb47d82/11361773208.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/wii_shooting_games_with_gun.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/xunupetokituzefebobizewel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be2764e-169c-4306-9928-4eeae4d7c08c/mile_a_minute_vine_flower.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/jexepasabuwib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa93785-8f99-44f0-afa2-075d3f31132e/3044368070.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/android_apps_play_store_free.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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 5064 bytes
SHA-256: c0434530b5b83ff08cd85babb444aadee778b3b5b9686bd9067831c07ef0b353
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 10504 bytes
SHA-256: 68b3bd07b9805477a328741a72cf2f0f7e7e79daf62c8b232fafcea80c228c0f

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