Malicious PDF — malware analysis report

Static analysis result for SHA-256 3466a14659c8ab59…

MALICIOUS

PDF

74.1 KB Created: 2021-05-18 10:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1cc2def46ef54e87f2da8f1237fcd131 SHA-1: 7544b245d4def15ca8af69cf32957b793f3a5fc3 SHA-256: 3466a14659c8ab59f6716d5ad743db31cff8a756caab4f40943fe2c5a21bb295
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 0.9990

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://pelibifir.ru/strik?utm_term=curso+de+electronica+moderna+cekit+pdf PDF link annotation
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/lufebozaxonev_dekokaxibej_rimasonut_lalogifusoju.pdfIn PDF document text
    • https://wipovatoz.weebly.com/uploads/1/3/4/0/134012317/20737811e0.pdfIn PDF document text
    • http://rixugofor.iblogger.org/amended_tax_return_form.pdfIn PDF document text
    • https://garusase.weebly.com/uploads/1/3/4/6/134634063/lobegeguzufo.pdfIn PDF document text
    • http://lipibolari.iblogger.org/apple_inc_introduction.pdfIn PDF document text
    • http://kovatawuwaluxud.iblogger.org/potica_aristteles_download.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/xuvaz.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/3fd9780.pdfIn PDF document text
    • http://lukaruji.iblogger.org/90957740213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jukoxisojow/difference_of_two_squares_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/zenusobusezure.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/fozidexilito.pdfIn PDF document text
    • http://wesukudepabu.epizy.com/59381157454.pdfIn PDF document text
    • http://papetamunamu.epizy.com/15987251861.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/appvn_apk_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/dawutedekijajeliv.pdfIn PDF document text
    • http://jagivaxo.rf.gd/nakora.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/free_illuminated_letters_templates.pdfIn PDF document text
    • http://pakekaririwofas.rf.gd/pajaven.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/annexure_1_form_7a.pdfIn PDF document text
    • http://wodixosikomo.rf.gd/predictable_revenue_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/alcatel_871a_specs.pdfIn PDF document text
    • http://sitozoke.rf.gd/46966725907.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 5268 bytes
SHA-256: 339a93098ce07c0993c5129ac136493fe575a042cb2f449053ff7d5623649ce6
font_01_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 11312 bytes
SHA-256: 40a1d44533c461e492b1f190811e078a68673fdcc1d97e2b860d709717f3fe0a
font_02_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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