Malicious PDF — malware analysis report

Static analysis result for SHA-256 1637a0db91c2e36b…

MALICIOUS

PDF

81.2 KB Created: 2021-02-26 01:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 00c45a211e5c05ff4b8f70201f9a4b9c SHA-1: d8207edfe0a61ea3d153d9398fb92d1dde5b8c77 SHA-256: 1637a0db91c2e36b761910041f0d2ce651f41da56c5db66554e6df5a5d29d7ce
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'Rainbow vacuum models reviews' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=rainbow+vacuum+models+reviews PDF link annotation
    • https://ranetaxute.weebly.com/uploads/1/3/4/8/134886021/1182073.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/e9b57d989afa.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/99373889582.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/dell_optiplex_9020_small_form_factor_i7.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/lg_4g_lte_hard_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/Tn4zjjj/1371396272.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/pijew_vegofuwuvenel_tefujonekaxapa.pdfIn PDF document text
    • https://muzobaxokeze.weebly.com/uploads/1/3/2/6/132682229/4184487.pdfIn PDF document text
    • https://gejowarog.weebly.com/uploads/1/3/2/7/132740172/nevewu.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/kobusuvo.pdfIn PDF document text
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/4117862.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/nigimul/the_very_hungry_caterpillar_worksheets_dltk.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/razoluxerudiwas.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/jadosunin.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/28468384437.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/19841802002.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/fidupe.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_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 5384 bytes
SHA-256: c32ab6b682a3a9c452aad6e428df3b60162d368391fc2c358c5a2cc4f418c504
font_01_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 10460 bytes
SHA-256: b1e892202c816a6f6b353131a7ccdae4e4c8eec383ed09e1972c5856007df3e4

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