Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9586998497aaac5…

MALICIOUS

PDF

101.6 KB Created: 2021-04-03 10:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ea07db5a3c4e1e467af69cfde9fa5d9 SHA-1: 9d2ca4e58a468e47df2ed9a6eee22a884b64519b SHA-256: d9586998497aaac5eb7b6e0fb4c96406293ea5a994a3e8fe4505d70db9911a44
186 Risk Score

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 0.9995

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://bologen.ru/aws?utm_term=how+to+define+system+engineering PDF link annotation
    • http://fuwiduwoxobol.mygamesonline.org/seepage_flow_net_examples.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/rowux.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/37453280475.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/51732547490.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/best_movies_like_the_devil_wears_prada.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/zasumav.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/the_wanderer_above_the_sea_of_fog.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/61929772761.pdfIn PDF document text
    • http://nuxuzuruguli.mypressonline.com/gender_minority_stress_and_resilience_scale.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/speak_now_1_workbook.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/bd94cfc7-f6c1-499b-836c-7af3ac36dddc/hp_stream_11_laptop_bag.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/simple_present_tense_negative_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae91830-f3d2-45e2-a460-b8250e099ce3/how_to_connect_sony_smartwatch_2_with_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5302a9-d52e-42aa-87f7-b882ddb9e5a1/silirefivemilagi.pdfIn PDF document text
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_af1dcb8858154d25bf36da71d9d0ab97.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_704b364dce99476da826e378e19095d7.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_cb0915aa826f498b8b4edbdc53951cbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb8fca2-bde6-401f-a8a8-e6212002934a/heat_transfer_book_for_chemical_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e25acf3-e03a-4cad-9472-fe227a211d1b/student_attendance_management_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1158aeae-9993-4580-bbf2-b23354d4d59c/1315728970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0c0df7-e0b8-42a0-acd6-48a7238c4719/87413328431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2150659-2ce8-4813-ae32-29b660db9fd5/58815185349.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/80623043077.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_off000150fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FB 5140 bytes
SHA-256: 5763e75edee36cd9ef05e748c51c2ef0720e49ce422fa9b1e78b2f1ced57e378
font_01_sfnt_off0001627f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1627F 11344 bytes
SHA-256: 8abe9c9e978f1833442d5943cea26e75fe4b940c17822c478a4c078f924c49a3