Malicious PDF — malware analysis report

Static analysis result for SHA-256 71028530602db596…

MALICIOUS

PDF

75.4 KB Created: 2021-06-13 09:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b31c8dece73d9a889514373c0f6765f1 SHA-1: c8527653bd5d74345c5e7639b548871f5dbcd96c SHA-256: 71028530602db5965040a23a9893e18686720ffa34f513cf818a07cbb8fe2c5a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. The embedded URLs, such as ketchas.ru, likely serve as the initial lure or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=biggest+80s+hits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459324/normal_5fd74331ab588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_603ce4ba5c332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_602ce8314f321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_603f150d4b8f4.pdfIn PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/4633196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fff35f5c8b12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484375/normal_60bbae2c0f31d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_604d6fadab98f.pdfIn PDF document text
    • https://watinamubil.weebly.com/uploads/1/3/0/8/130813586/nezikazunuxuruzof.pdfIn PDF document text
    • https://tuzakalo.weebly.com/uploads/1/3/4/4/134492431/cf8d4372e9.pdfIn PDF document text
    • https://vigenawora.weebly.com/uploads/1/3/4/4/134495248/5de05c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_605204dc20392.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/308c931c-fbab-4aed-a6d2-3720707f3c40/15929876417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d69a80-7142-4703-928e-a9f16729ac26/how_much_is_a_2007_audi_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763fa418-e17c-482f-a37d-f5088baa5538/gosaresewiregov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c12ab0f-468f-4aae-a423-890b4799b54d/21414361806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf5aa8a-3925-42b4-89ae-0eb15c4166bf/the_secret_to_money_by_rhonda_byrne_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f13006f-2069-403d-a2de-3f2f46271ec6/max_lucado_daily_devotional_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1e3386-4998-4a01-8493-a9db82b3bb19/pujupilovosubozivoxamod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b65f0dc-6c22-47e5-a835-f70dcb140233/how_to_change_your_name_on_nys_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/800914ee-44e3-45b2-8589-c48ea679b8bb/warm_bodies_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e356490a-4cab-4b57-9a4f-bdb679a071eb/mifoxulinal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac0041b-2706-4519-8044-7e400cfa1a54/vukorifebesokolomutul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d435053b-fb2c-4351-857a-12745bc0cdfc/xesibazexawusulesamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbad8b5-0ca7-4632-8878-d97dfd26d539/english_grammar_understanding_the_basics_download.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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 4992 bytes
SHA-256: fb3737bb0311b2d5db0fbf4921c027bf291d5d20644ac110b14756b413341fc7
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 11152 bytes
SHA-256: 8e5adabe8830eeb0bee1aaa3ecd619059d92040fa6746f035b3b7dfba8ee75fa