Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6e2fb341ebb912…

MALICIOUS

PDF

87.0 KB Created: 2021-02-21 18:27:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ebcc68a0b977927b668a46c36dc92429 SHA-1: 536326fc90425fb67675d9357612a0bd73e581e0 SHA-256: 5b6e2fb341ebb912aca535485429d95420d62778d7dee2efcfbc1ff0ade60ee6
156 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 0.9998

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
  • 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://druttle.ru/123?utm_term=french+re+verb+conjugation+quiz PDF link annotation
    • https://xofivexaroza.weebly.com/uploads/1/3/4/3/134321457/a0f07ebb.pdfIn PDF document text
    • https://nifakisafuzum.weebly.com/uploads/1/3/0/7/130775286/fikulu.pdfIn PDF document text
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/2633ef37eb1.pdfIn PDF document text
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/piligosu.pdfIn PDF document text
    • https://bigevavez.weebly.com/uploads/1/3/4/0/134016854/voribosagobef-lusujozobej-vamijugipemi.pdfIn PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/7b5a4ee1470ff.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/nokiva/conservation_of_natural_resources_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/51765134808.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/breakers_revenge_mame_rom.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/mitilidowikotiduve.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/36667481423.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/greatest_common_factor_worksheets_common_core.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/annabelle_full_movie_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/android_studio_themes_application.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/73138841145.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/blank_snapback_hat_template_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/best_admin_template_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/17846724652.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_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 5260 bytes
SHA-256: cf91cdfade4d57d2df80fc5796240adf1471ba5edf6c2b9802a55b012961c481
font_01_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 13628 bytes
SHA-256: bd1ae479eb10f3cfc82bb3a0f29626a006c3ffe12c8abfc658f91fac34be5330

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