Malicious PDF — malware analysis report

Static analysis result for SHA-256 752446b277a88a44…

MALICIOUS

PDF

79.0 KB Created: 2020-12-11 16:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 24317b383e1c831c243a4a663cca5cda SHA-1: 98454bbeff011386abb0a805ff349b6ca468d3ed SHA-256: 752446b277a88a44a77b031f2edfb77a47b79f7b6583c74d5866381e49dc53c3
156 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 0.9997

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
  • 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://trafffi.ru/123?utm_term=virchow+cell+theory PDF link annotation
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/tezepug-rivibepapadafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5fa2c3bb4d505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/punxsutawney_pa_zip_code.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf1d49d7936484053b373/1606283732778/citi_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/xepogavotijid.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/reragaxiwetekapov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4589afc-8d07-4d4b-84cd-1ae21c91611d/cadena_de_favores_pelicula_completa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50f7fa3bf4b14abc3d51e/t/5fcb80e266ddd570b0f66f8a/1607172323370/building_services_inc_houston.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf5c3c7afe470b555c522/1606219206266/fashion_story_hack_android_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ea6ac6229360ecad0c46/t/5fcb2a51da45e86cca9f17ea/1607150165921/simcity_buildit_cheats_no_survey_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/phoenician_alphabet_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1497f116eb00e3c4e9468/t/5fc949a26dcffd2c339030e3/1607027107351/53828199708.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_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 4660 bytes
SHA-256: 88d2a1fb2ac165ce46850d7cc35ae4cf2d30ec288802fd907e6f2a92ff967458
font_01_sfnt_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 11096 bytes
SHA-256: 1800f2d689ea16d6a4da235402731952875cfc25be319a415a540345789ebfeb

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